把(x-y)或(x+y)看做一整体,合并下列各式中的同类项:
(1)2(x-y)-4(x-y)³-(x-y)+4(x-y)²(2)3(x+y)²-4(y-x)-7(x-y)+4(x+y)²...
(1) 2(x-y)-4(x-y)³ -(x-y)+4(x-y)²
(2) 3(x+y)²-4(y-x)-7(x-y)+4(x+y)² 展开
(2) 3(x+y)²-4(y-x)-7(x-y)+4(x+y)² 展开
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