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mentiennguyenngocthuy19022007
2 năm trước
Bài 1: A, 5x . ( 2x^2 - 3x +7 ) B, ( 2x + y ) . ( x - y) Bài 2: A, 2x^2 - 4xy B, a^2 - b^2 + 4a + 4 Bài 3: 1,tìm x a, x^3 - 144x = 0 b, 2x ( 3x - 5) - 3x (2x +4) = 44 2,tính nhanh: 73^2 + 27^2 + 54 . 73 3phép chia: a,1 -1 - x^4y^5 : ( - x^3y^2) 4 2 b, ( 16x^4y^3 -20x^2y3 - 4x^4y^4 ) : 4x^2y^2
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