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7.8乘以0.2+78乘以0.98的简便方法怎么计算
人气:206 ℃ 时间:2019-11-03 00:03:46
解答
7.8乘以0.2+78乘以0.98
=78*0.02+78*0.98
=78*(0.02+0.98)
=78*1
=78
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