1,3题分解因式
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1)原式=x(x-y)-y(x-y)=(x-y)(x-y)=(x-y)^2
3)原式=3(x-y)^2-3(x-y)^3=3(x-y)^2[1-(x-y)]
=3(x-y)^2(y-x+1)
3)原式=3(x-y)^2-3(x-y)^3=3(x-y)^2[1-(x-y)]
=3(x-y)^2(y-x+1)
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(1) 没问题
(2)原式 = 3(x-y)^2 - 3(x-y)^3 = 3(x-y)^2 * [1-(x-y)] = 3(1-x+y)(x-y)^2
(2)原式 = 3(x-y)^2 - 3(x-y)^3 = 3(x-y)^2 * [1-(x-y)] = 3(1-x+y)(x-y)^2
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