Ôn tập Toán HK I lớp 8

ÔN TẬP TOÁN HKI Bài 1: a) Làm tính nhân: 3x .(x2-2x+5)……………………………………………………………………. b) Viết HĐT bình phương của một tổng rồi tính nhanh: 1012 ………………………………................................................................................................................................... ..............................................………………………………………………………………………………………. Bài 2: Phân tích các đa thức sau thành nhân tử: a) 10x2y-5xy2 b) x2 -5xy +2x - 10y ………………………………................................................................................................................................... ................................................................................................................................................................................... ..............................................………………………………………………………………………………………. Bài 3:

a) Làm tính chia: (6x3 - 7x2 - x +2) : (2x + 1) b) Rút gọn phân thức:

2 6 9 2 6 x x x    ………………………………................................................................................................................................... ..............................................………………………………………………………………………………………. ………………………………................................................................................................................................... ..............................................………………………………………………………………………………………. ………………………………................................................................................................................................... ..............................................………………………………………………………………………………………. ………………………………................................................................................................................................... ..............................................………………………………………………………………………………………. ………………………………................................................................................................................................... ..............................................………………………………………………………………………………………. ………………………………................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ..............................................………………………………………………………………………………………. Bài 4:

1) Tính: ………………………………………………………………………………………..

2 2 1 1 1 1 x x x x x     

2) Cho biểu thức A = (với x ≠ 3; x ≠ – 3). 2 9

) 1( 2 3 1 3 1

x

x x x

x x

x



     



a. Rút gọn biểu thức A. ………………………………................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... …