Kiem tra

KIỂM TRA ĐẠI SỐ 45phút
Họ và tên :…………………… Ngày tháng 10 năm 2010
Lớp : 8A2
Đề bài
Câu 1: Viết bảy hằng đẳng thức đáng nhớ (3điểm)
Áp dụng tính nhanh : a) 872 + 26 . 87 + 132
b) 502 – 492 + 482 – 472 + … + 22 – 12
Câu 2: Rút gọn các biểu thức sau : (3điểm)
(2x + 1)2 + 2(4x2 – 1) + (2x – 1)2
(x – 3)(x + 3) – (x – 3)2
Câu 3: Phân tích các đa thức sau thành nhân tử: (4điểm)
x2 – y2 – 5x + 5y
2x2 – 5x – 7
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KIỂM TRA ĐẠI SỐ 45phút
Họ và tên :…………………… Ngày tháng 10 năm 2010
Lớp : 8A1
Đề bài
Câu 1: CMR số 3599 viết được dưới dạng tích hai số tự nhiên khác 1(3điểm)
Câu 2: Rút gọn biểu thức : (3điểm)
(3x – 1)2 + 2(3x – 1)(2x + 1) + (2x + 1)2
(x2 + 1)(x – 3) – (x – 3)(x2 + 3x + 9)
(x2 – 1)(x + 2) – (x – 2)(x2 + 2x + 4)
Câu 3: Phân tích các đa thức thành nhân tử (3điểm)
x3 – x2 – 4x2 + 8x – 4
(x2 + x)2 + 4x2 + 4x – 12
x(x + 1)(x + 2)(x + 3) + 1
Câu 4: Chứng minh rằng nếu a2 + b2 + c2 = ab + ac + bc thì a = b = c(1điểm)
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