8a(b-a)²+2(a-b)³
=(a-b)²[8a+2(a-b)]
=(a-b)²(10a-2b)x的m次方-2x的m-1次方+2x的m-2次方该怎么做x^m-2x^(m-1)+2x^(m-2)=x^(m-2)(x²-2x+2)
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