几道初二因式分解题(1)X^3-1 (2) 2a^2+4ab+2b^2 (3) (XY)^-1 (4) (x-y)^2+4xy (5) 2x(a-2)-y(2-a)

问题描述:

几道初二因式分解题
(1)X^3-1 (2) 2a^2+4ab+2b^2 (3) (XY)^-1 (4) (x-y)^2+4xy (5) 2x(a-2)-y(2-a)

1.x³-1=(x-1)(x²+x+1) 立方差公式2.2a^2+4ab+2b^2=2(a²+2ab+b²)=2(a+b)²3.(xy)²-1=(xy+1)(xy-1)4.(x-y)^2+4xy =x²-2xy+y²+4xy=x²+2xy+y²=(x+y)²5....