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7.98*90.1+79.8*0.94+3.99怎样简便计算
人气:311 ℃ 时间:2019-08-30 14:27:52
解答
7.98*90.1+79.8*0.94+3.99
=7.98*90.1+7.98*9.4+7.98*0.5
=7.98*(90.1+9.4+0.5)
=7.98*100
=798
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