=3a-3b+4a-4b+4+2a-2b
=9a-9b+4
3（a-b）-4(-a+b-1)+2(a-b)先去括号,再合并同类项
3（a-b）-4(-a+b-1)+2(a-b)先去括号,再合并同类项
数学人气：544 ℃时间：2020-05-09 23:02:48
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