x(x-y)-y(y-x)(x+y)²+mx+mya(x-a)(x+y)²-b(x-a)²(x+y)这些题怎么写?x(x-y)-y(y-x)(x+y)²+mx+mya(x-a)(x+y)²-b(x-a)²(x+y)
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问题描述：
x(x-y)-y(y-x)(x+y)²+mx+mya(x-a)(x+y)²-b(x-a)²(x+y)这些题怎么写?
x(x-y)-y(y-x)(x+y)²+mx+mya(x-a)(x+y)²-b(x-a)²(x+y)
费栋回答：
①x(x-y)-y(y-x)=x(x-y)＋y(x-y)=(x-y)(x+y)②(x+y)²+mx+my=(x+y)²+m(x+y)=(x+y)(x+y+m)③a(x-a)(x+y)²-b(x-a)²(x+y)=(x-a)(x+y)[a(x+y)-b(x-a)]=(x-a)(x+y)[ax+ay-bx+ab}
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