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(69.9-4.74-5.16)*6.5怎么简便计算
人气:418 ℃ 时间:2020-04-03 04:15:15
解答
(69.9-4.74-5.16)*6.5
=(69.9-(4.74+5.16))*6.5
=(69.9-9.9)*6.5
=60*6.5
=60*6+60*0.5
=360+30
=390
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