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0.81乘0.81乘99 怎么用简便方法计算?
人气：413 ℃　时间：2019-12-05 10:40:42
解答
0.81乘0.81乘99
=0.81X0.81X99
=0.81X0.81X(100-1)
=0.81X0.81X100-0.81X0.81
=0.81X81-0.81X0.81
=0.81X(81.0.81)
=0.81X80.19
=64.9539
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