7.8乘4.9减7.8加7.6乘6.1的简便计算
7.8*4.9-7.8+7.6*6.1的简便计算
人气：149 ℃ 时间：2020-01-30 14:19:33
解答
7.8*(4.9+5.9+1)
=7.8*11.8
=92.04
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