合并同类项!5(x+y)²-3(x+y)³+3(x+y)²-5(x+y)³其中x=-1,y=二分之一
1个回答
5(x+y)²-3(x+y)³+3(x+y)²-5(x+y)³
=8(x+y)²-8(x+y)³
=8(x+y)²(1-x-y)
=8×(-1+1/2)²(1+1-1/2)
=8×1/4×3/2
=3
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