6m(m-n)²-8(n-m)

问题描述:

6m(m-n)²-8(n-m)

6m(m-n)²-8(n-m)
=6m(m²-2mn+n²)-8n+8m
=6m的三次方-12m²n+6mn²-8n+8m
(不好意思,三次方不知道怎么打)