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(—32)—17—(—65)+5简便计算
人气:145 ℃ 时间:2019-12-11 05:00:40
解答
(—32)—17—(—65)+5
=-(32+17)+65+5
=-49+70
=21(—7,7) +(—2,3)—(—12,6)简便计算
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