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-5a+(3a-2)-(3a-7)=?
人气:184 ℃ 时间:2020-05-21 10:35:18
解答
-5a+(3a-2)-(3a-7)
=-5a+3a-2-3a+7
=-5a+3a-3a-2+7
=-5a+5
=5-5a
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