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80.5*2.8+143.5
人气:445 ℃ 时间:2020-05-28 13:28:00
解答
=80.5*(3-0.2)+143.5
=80.5*3-80.5*0.2+143.5
=241.5-16.1+143.5
=143.5-16.1+241.5
=127.4+241.5
= 368.9
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