-5a+(3a-2)-(3a-7)=?
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-5a+(3a-2)-(3a-7)=?
-5a+(3a-2)-(3a-7)=?
-5a+(3a-2)-(3a-7)=?
-5a+(3a-2)-(3a-7)
=-5a+3a-2-3a+7
=-5a+3a-3a-2+7
=-5a+5
=5-5a
-5a+5
-5a+(3a-2)-(3a-7)
=-5a+3a-2-3a+7
=-5a+5
吧把括号打开在合并同类项
=-5a+5
-5a+(3a-2)-(3a-7)= -5a+3a-2-3a+7=-5a+3a-3a-2+7=-5a+5(或5-5a)
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