Kiểm tra 1 tiết chương I môn Đại số khối 8

TRƯỜNG THCS ............ KIỂM TRA 1 TIẾT CHƯƠNG I LỚP 8 MÔN : ĐẠI SỐ 8 ____________________________________________________________________

Điểm Nhận xét của giáo viên .................................................................. ................................................................... Bài 1: (2 điểm) Rút gọn biểu thức: a)(x – 3)3 – (x + 2)2 b) (4x2 + 2xy + y2)(2x – y) – (2x + y)(4x2 – 2xy + y2) Bài 2: (3 điểm) Phân tích các đa thức sau thành nhân tử : a) a2 – ab + a – b b) m4 – n6 c) x2 + 6x + 8 Bài 3: (3 điểm) Tìm x a) x2 – 16 = 0 b) x4 – 2x3 + 10x2 – 20x = 0 c) 15 – 2x – x2 = 0 Bài 4: (1điểm) Tìm n  Z để 2n2 + 5n – 1 chia hết cho 2n – 1

Bài 5: (1 điểm) Tìm giá trị nhỏ nhất của M = x2 + 4x + 2 Bài Làm ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ …