X(X-Y)(a-b)-Y(Y-x)(b-a)
1个回答
X(X-Y)(a-b)-Y(Y-x)(b-a)
=x(x-y)(a-b)+y(x-y)(b-a)
=x(x-y)(a-b)+y(x-y)(a-b)
=(x-y)(a-b)(x+y)
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