Kiểm tra chương III Đại số kì 2 Lớp 8

Họ và tên :…………………….. Kiểm tra chương III
Lớp: ………………………….. 

Điểm




Lời phê của cô giáo

Đề bài: 
Câu 1 (3 điểm) : Em hãy chọn câu trả lời đúng trong các đáp án A, B, C, D 
1/ Hai phương trình nào tương đương:
A. 4x + 3 = 0 và 4x2 + 3 = 0 B. x = 0 và x = x 
C. x + 1 = x và x + 1 = x + 1 D. x2 + 3 = 0 và (x2 + 3).(x – 5) = 0
2/ Phương trình 3x + m = x -1 nhận x = -3 là nghiệm, m có giá trị bằng bao nhiêu?
A. 13 B. -13 C. 5 D. -5
Câu 2 (4 điểm) : Giải các phương trình:
 a/ + = 2,5 x – 1
 b/ + = 
Câu 3 (3 điểm) : Một người đi xe đạp từ A đến B với vận tốc trung bình 15km/h. Lúc về người đó chỉ đi với vận tốc trung bình 12km/h nên thời gian về nhiều hơn thời gian đi là 45 phút. Tính độ dài quãng đường AB.
Bài làm
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