kiểm tra toán 8

Họ và tên:......................... Bài kiểm tra
Trường THCS Thiện Phiến Môn: Toán 8
Lớp : Thời gian:45 phút
A:Trắc nghiêm
Khoanh tròn chữ cái đứng trước kết quả đúng:
Bài 1(1đ): Kết quả của phép nhân:






+−−
3
x
5
4
xy
4
5
x2xy
là
A:
yx
3
4
yx
4
5
xy2
322

++−
C:
yx
3
4
yx
4
5
yx2
2222
++
B:
yx
3
4
yx
4
5
yx2
4222
−+−
D:
yx
3
4
yx
4
5
yx2
3222

++−
Bài 2(1đ): Kết quả của phép chia (24x
2
y – 8xy + 32xy
2
): (-8xy) là
A: 3x
2
+ 2y – 1 C: 3x – 1 + 4y
B: - 3x + 1 – 4y D: 3x – 1 – 4y
Bài 3(1đ): Kết quả của phép chia (x
3
– 3x
2
+ x – 3): ( x – 3) là
A: x
2
– 1 C: x
2
+ 1
B: x
2
+ x + 1 D: x
2
– x - 1
Bài 4(1đ): Đẳng thúc nào đúng:
A: (x – 2)(x
2
+ x + 4) = ( x
3

– 8) C: (2x + 3)( 2x – 3) = 2x
2
– 9
B: x
2
– 12x + 4 = (3x – 2)
2
D: x
3
– 3x
2
+ 3x + 1 = ( x – 1 )
3
B:Tự luận:
Bài 1(3đ):Phân tích đa thức thành nhân tử
a) xy + y
2
– x – y
b) 2x
2
+ 5x
3
+ x
2
y
Bài 2(2đ): làm phép tính chia
(x
4
– x
3

– 3x
2
+ x + 2):( x
2
– 1)
Bài 3(1đ):Tìm a để đa thức 2x
3
– 3x
2
+ x + a chia hết cho đa thức x +2
Bài giải
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