Kiểm tra môn: Toán học khối 8

Họ tên:..
Lớp:..................... KIỂM TRA
Môn : Toán. Thời gian:15 phút.
 Điểm
 Lời phê của cô giáo
 Nhận xét của phụ huynh
Bài 1: ( 1,5 điểm) Tính nhanh:
 a) 8922 + 892 . 216 + 1082 b) 362 + 262 – 52 . 36 
Bài 2: ( 3 điểm) Tính:
 a) x (x2 + 4x – 3) –(2 x + 1)(2x – 5) b) (2x - 3)(3 + 2x) + (x – 2)3
 c) (9x2 + 6x + 1) : (1 + 3x) d) (2x3 - 5x2 + 6x - 15) : (2x - 5)
Bài 3( 3,5 điểm): Phân tích đa thức thành nhân tử:
a) 2x3y – 8x2y + 8xy b) 4x2 + 8xy – 3x – 6y
 c) x2 – 4xy + 4y2 – 9 d) x2 + x – 12
Bài 4: ( 1,5 điểm) Tìm x, biết:
a) (3x – 1)( 2x + 3) – 6x(x – 3) = 0 b) ( x + 2)(3x – 1) = ( x + 2)(5x + 2)
Bài 5 ( 0,5 điểm): Chứng minh biểu thức sau luôn dương với mọi giá trị của biến x và y
A = x2 – 6xy + 2+ 2x – 6y + 9y2
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