1.因式分解-m2(r-1)+m-m2
1个回答

1.因式分解-m2(r-1)+m-m2

=m[-m(r-1)+1-m)

=m(1-mr)

2.因式分解m(r-1)2-(r-1)-m(1-r)

=(r-1)[m(r-1)-1+m]

=(r-1)(mr-1)

3.用题1和2的结果因式分解

-[-m2(r-1)+m-m2]-[m(r-1)2-(r-1)-m(1-r)]

=-m(1-mr)-m(mr-1)

=m(mr-1)-m(mr-1)

=0