因式分解:3m(x-y)-9n(y-x)
问题描述:
因式分解:3m(x-y)-9n(y-x)
答
=3m(x-y)+9n(x-y)
=3(x-y)(m+3n)
因式分解:3m(x-y)-9n(y-x)
=3m(x-y)+9n(x-y)
=3(x-y)(m+3n)