(-m+n）²-m(2m-n)?

来源：学生作业帮助网编辑：作业帮时间：2024/05/03 06:42:51

(-m+n）²-m(2m-n)?
(-m+n）²-m(2m-n)?

(-m+n）²-m(2m-n)?
(-m+n）²-m(2m-n)
=m²-2mn+n²-2m²+mn
=-m²-mn+n²

=m²+n²-2mn-2m²+mn
= -m²+n²-mn
=n²-m²-mn