10a(x-y)²-5b(y-x)

5（y-x)(2ay-2ax-b)
(x-y)(a-x)(a-y)
再问： 我怀疑你做的对不对，求过程
再答： 10a(x-y)²-5b(y-x) =10a(y-x)²-5b(y-x) =5(y-x)(2ay-2ax-b) x-(a-x)(a-y)-y（x-a)(y-a) =x-(a-x)(a-y)-y（a-x)(a-y) =(x-y)(a-x)(a-y)
再问： 辛苦你啦