x(m-x)(m-y)-m(x-m)9y-m)
问题描述:
x(m-x)(m-y)-m(x-m)9y-m)
答
x(m-x)(m-y)-m(x-m)(y-m)
=x(m-x)(m-y)-m(m-x)(m-y)
=(m-x)(m-y)(x-m)
=-(m-x)^2(m-y)