请帮帮忙,谢谢
2个回答
2014-03-22
展开全部
(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)
=-2mn+2m+3n-3mn-2n+2m-m-4n-mn
=-6mn+3m-3n
=-6mn+3(m-n)
=-6×(-1)+3×4
=18
=-2mn+2m+3n-3mn-2n+2m-m-4n-mn
=-6mn+3m-3n
=-6mn+3(m-n)
=-6×(-1)+3×4
=18
追问
谢谢你
追答
不客气
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