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0.79×2.5+7.9×0.75怎样简便计算
人气:103 ℃ 时间:2020-01-28 22:28:56
解答
0.79×2.5+7.9×0.75
=0.79*2.5+0.79*10*0.75
=0.79*(2.5+10*0.75)
=0.79*(2.5+7.5)
=0.79*10
=7.9
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