Kiểm tra một tiết môn toán lớp 8 (Đại Số)

Họ Và Tên:.......................................
KIỂM TRA MỘT TIẾT
Lớp:......
MÔN TOÁN LỚP 8 (ĐẠI SỐ)
ĐIỂM
Lời phê của giáo viên



 Học sinh làm bài ngay vào tờ giấy này
Bài1:(2,5điểm): Hãy chọn mỗi nội dung ở cột 1 và 1 nội dung tương ứng ở cột 2 để thành 1 đẳng thức đúng:
1

2
A.(2x+3)2

a.25x2-36y2
B.(3x-4)3

b.125x3 +216y3
C.x2y2 -1

c.4x2 +12x+9
D.(5x+6y)(25x2 -30xy+36y2)

d.27x3-108x2+144x-64
E.(5x+6y)(5x-6y)

e.(xy+1)(xy-1)
Bài 2(2điểm) Chọn ý đúng nhất trong mỗi câu từ câu 1 đến câu4 và khoanh tròn chữ cái đứng trước ý được chọn
Câu1:(x-2y)(2y+x) bằng:
a/x2-4y b/ x2-4y3 c/ x2-4y2 d/ x2-4y4
Câu2: Giá trị của biểu thức 15x4y3z2:5xy2z2 tại x=2,y=-10 và z=2004 là:
a.240 b/204 c/-240 d/340
Câu3:(26x4y3-39x2y2+169x3y4):13x2y2 bằng:
a/2x2y-3x+13xy2 b/2x2y-3+13xy2 c/2x2y2-3+13xy2 d/2x2y-3+13xy3 
Câu4:(a2+2ab+b2) bằng
a/(a+b)2 b/(a+b)3 c/(a-b)2 d/(a-b)3
 Bài3(3,5điểm).Phân tích các đa thức sau thành nhân tử:
a/3xy - 6x2y..............................................................................................................
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.............................................................................................................................................b/x2y4 -1.............................................................................................................................
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c/x3-64.............................................................................................................................
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d/x2+m -4xm+1 +4xm..........................................................................................................
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Bài 4(2điểm).a/Tìm x biết :2x(x-5) -x(3+2x) =26
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b/Cho m+n+p=0 .Chứng minh: m3+n3+p3 =3mnp
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Họ Và Tên:.......................................
KIỂM TRA MỘT TIẾT
Lớp:......
MÔN TOÁN LỚP 8 (ĐẠI SỐ)
ĐIỂM
Lời phê của giáo viên



 Học sinh làm bài ngay vào tờ giấy này
Bài1:(2,5điểm): Hãy chọn mỗi nội dung ở cột 1 và 1 nội dung tương ứng ở cột 2 để thành 1 đẳng thức đúng:
1

2
A.(2x+3)2

a. (xy+2)(xy-2)
B.(3x-4)3

b.125x3 +216y3
C.x2y2 -4

c.4x2 +12x+9
D.(5x+6y)(25x2 -30xy+36y2)

d.27x3-108x2+144x-64
E.(5x+6y)(5x-6y)

e. 25x2-36y2
Bài 2(2điểm) Chọn ý đúng nhất trong mỗi câu từ câu 1 đến câu4 và khoanh tròn chữ cái đứng trước ý được chọn
Câu1:(x-2y)(2y+x) bằng:
a/x2-4y b/ x2-4y3 c/ x2-4y2 d/ x2-4y4
Câu2: Giá trị của biểu thức 15x4y3z2:5xy2z2 tãi=2,y=-10 và z=2004 là:
a.240 b/204 c/-240 d/340
Câu3:(12x4y3-18x2y2+36x3y4):6x2y2 bằng:
a/2x2y-3x+6xy2 b/2x2y-3+6xy2 c/2x2y2-3+6xy2 d/2x2y-3+6xy3 
Câu4:(a2-2ab+b2) bằng
a/(a+b)2 b/(a+b)3 c/(a-b)2 d/(a-b)3
Bài3(3,5điểm).Phân tích các đa thức sau thành nhân tử:
a/4xy - 12x2y..............................................................................................................
............................................................................................................................................
.............................................................................................................................................b/x2y4 -1.............................................................................................................................
..........................................................................................................................................................................................................................................................................................
c/x3-125.............................................................................................................................
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d/x2+m -4xm+1 +4xm..........................................................................................................
.........................................................................................................................................................................................................................................................................................

Bài 4(2điểm).a/Tìm x biết :3x(x-5) -x(3+3x) =36
....................................................................................................................................................................................................................................................................................................................................................................................................................................... .......................................................................................................................................................................................................................................................................................................................................................................................................................................
b/Cho a+a+c=0 .Chứng minh: a3+b3+c3 =3abc
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