Kiểm tra 1 tiết Lớp 8 Môn: Đại Số Trường THCS Lê Bình
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Trường THCS Lờ Bỡnh KIỂM TRA 1 tiết Lớp 8B Mụn: Đại Số Họ và tờn: ……………………………………………….. Điểm Lời nhận xột của giỏo viờn Bài 1: (1điểm) Tỡm điều kiện xỏc định của phương trỡnh sau: ...................................................................................................................................................... ...................................................................................................................................................... Bài 2: (6điểm) Giải cỏc phương trỡnh sau: 2x + 4 = 0 b) 3x – 1 = 13 - 4x .................................................................................................................................................... .................................................................................................................................................... .................................................................................................................................................... c) (x – 1)(2x + 3) = 0 d) .................................................................................................................................................... ........................................................................................................................................................................................................................................................................................................ ........................................................................................................................................................................................................................................................................................................ .................................................................................................................................................... d) e) ........................................................................................................................................................................................................................................................................................................ ........................................................................................................................................................................................................................................................................................................ ............................................................................................................................................................................................................................................................................................................................................................................................................................................................ ........................................................................................................................................................................................................................................................................................................ Bài 3: (2điểm) Một người đi xe mỏy từ Hồng Thủy về Huế với vận tốc 45km/h. Lỳc đi lờn (Huế - Hồng Thủy) người đú đi với vận tốc 35km/h nờn thời gian đi lờn nhiều hơn thời gian khi về là 40 phỳt. Tớnh độ dài quóng đường từ Hồng Thủy đến Huế? ........................................................................................................................................................................................................................................................................................................ ........................................................................................................................................................................................................................................................................................................ ............................................................................................................................................................................................................................................................................................................................................................................................................................................................ ........................................................................................................................................................................................................................................................................................................ .................................................................................................................................................... Bài 4(2 điểm): a) Chứng minh bất đẳng thức sau: (với x và y cựng dấu) b) Tỡm giỏ trị nhỏ nhất của biểu thức P = (với ) ............................................................................................................................................................................................................................................................................................................................................................................................................................................................ ........................................................................................................................................................................................................................................................................................................ ............................................................................................................................................................................................................................................................................................................................................................................................................................................................ ........................................................................................................................................................................................................................................................................................................ ............................................................................................................................................................................................................................................................................................................................................................................................................................................................ ........................................................................................................................................................................................................................................................................................................ Trường THCS Lờ Bỡnh KIỂM TRA 1 tiết Lớp 8B Mụn: Đại Số Họ và tờn: ……………………………………………….. Điểm Lời nhận xột của giỏo viờn Bài 1: (1điểm) Tỡm điều kiện xỏc định của phương trỡnh sau: ...................................................................................................................................................... ...................................................................................................................................................... Bài 2: (6điểm) Giải cỏc phương trỡnh sau: 3x - 6 = 0 b) 5x – 5 = 13 - 4x .................................................................................................................................................... .................................................................................................................................................... .................................................................................................................................................... c) (2x – 1)(2x -8) = 0 d) .................................................................................................................................................... ........................................................................................................................................................................................................................................................................................................ ........................................................................................................................................................................................................................................................................................................ .................................................................................................................................................... d) e) ........................................................................................................................................................................................................................................................................................................ ........................................................................................................................................................................................................................................................................................................ ............................................................................................................................................................................................................................................................................................................................................................................................................................................................ ........................................................................................................................................................................................................................................................................................................ Cõu 3 : (2,5điểm). Giải bài toỏn bằng cỏch lập phương trỡnh : Một người đi xe mỏy từ A đến B, vận tốc 35km/h. Lỳc về người đú đi với vận tốc 30km/h do đú thời gian về nhiều hơn thời gian đi là 30phỳt. Tớnh quóng đường AB ? ............................................................................................................................................................................................................................................................................................................................................................................................................................................................ .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................Bài 4(2 điểm): a) Chứng minh bất đẳng thức sau: (với x và y cựng dấu) b) Tỡm giỏ trị nhỏ nhất của biểu thức P = (với ) .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Trường THCS Lờ Bỡnh KIỂM TRA 1 tiết Lớp 8B Mụn: Đại Số Họ và tờn: ……………………………………………….. Điểm Lời nhận xột của giỏo viờn Bài 1: (1điểm) Tỡm điều kiện xỏc định của phương trỡnh sau: ...................................................................................................................................................... ...................................................................................................................................................... Bài 2: (6điểm) Giải cỏc phương trỡnh sau: 3x - 8 = 0 b) 6x – 3 = 13 - 2x .................................................................................................................................................... .................................................................................................................................................... .................................................................................................................................................... c) (5x – 1)(8-4x) = 0 d) .................................................................................................................................................... ........................................................................................................................................................................................................................................................................................................ ........................................................................................................................................................................................................................................................................................................ .................................................................................................................................................... d) e) ........................................................................................................................................................................................................................................................................................................ ........................................................................................................................................................................................................................................................................................................ ............................................................................................................................................................................................................................................................................................................................................................................................................................................................ ........................................................................................................................................................................................................................................................................................................ Câu8(2điểm).Trong một buổi lao động, lớp 8A gồm 40 học sinh chia thành hai tốp: tốp thứ nhất trồng cây, tốp thứ hai làm vệ sinh. Tốp trồng đông hơn tốp làm vệ sinh là 8 ng ời. Hỏi tốp trồng cây có bao nhiêu ng ời ? ............................................................................................................................................................................................................................................................................................................................................................................................................................................................ .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................Bài 4(2 điểm): a) Chứng minh bất đẳng thức sau: (với x và y cựng dấu) b) Tỡm giỏ trị nhỏ nhất của biểu thức P = (với ) .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Trường THCS Lờ Bỡnh KIỂM TRA 1 tiết Lớp 8B Mụn: Đại Số Họ và tờn: ……………………………………………….. Điểm Lời nhận xột của giỏo viờn Bài 1: (1điểm) Tỡm điều kiện xỏc định của phương trỡnh sau: ...................................................................................................................................................... ...................................................................................................................................................... Bài 2: (6điểm) Giải cỏc phương trỡnh sau: 8 - 4x = 0 b) 6 – 3x = 14 + 2x .................................................................................................................................................... .................................................................................................................................................... .................................................................................................................................................... c) (5x – 1)(8-4x) = 0 d) .................................................................................................................................................... ........................................................................................................................................................................................................................................................................................................ ........................................................................................................................................................................................................................................................................................................ .................................................................................................................................................... d) e) .......................................................................................................................................................................................................................................................................................
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