3(a-b)-4(-a+b-1)+2(a-b)先去括号,再合并同类项
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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
3(a-b)-4(-a+b-1)+2(a-b)先去括号,再合并同类项
=3a-3b+4a-4b+4+2a-2b
=9a-9b+4
3(a-b)-4(-a+b-1)+2(a-b)
=3a-3b+4a-4b+4+2a-2b
=﹙3+4+2﹚a+﹙-3-4-2﹚b+4
=9a-9b+4
3(a-b)-4(-a+b-1)+2(a-b)
=3a-3b+4a-4b+4+2a-2b
=(3+4+2)a+(-3-4-2)b
=9a+9b
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