令a=x-y
原式=-(a³-1)+3a²-3a
=-(a-1)(a²+a+1)+3a(a-1)
=-(a-1)(a²+a+1-3a)
=-(a-1)(a²-2a+1)
=-(a-1)³
=-(x-y-1)³
1-3(X-Y)＋3(X-Y)²-(X-Y)3次方次方因式分解
1-3(X-Y)＋3(X-Y)²-(X-Y)3次方次方因式分解
数学人气：767 ℃时间：2019-09-29 00:31:24
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