计算：2(x+y)²[3(-x-y)³]+[2(x+y)]³[2(-x-y)²]
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计算：2(x+y)²[3(-x-y)³]+[2(x+y)]³[2(-x-y)²]计算：2(x+y)²[3(-x-y)³]+[2(x+y)]&
计算：2(x+y)²[3(-x-y)³]+[2(x+y)]³[2(-x-y)²]
计算：2(x+y)²[3(-x-y)³]+[2(x+y)]³[2(-x-y)²]
计算：2(x+y)²[3(-x-y)³]+[2(x+y)]³[2(-x-y)²]
=-6(x+y)的5次方+16(x+y)的5次方
=10(x+y)的5次方