0.81乘0.81乘99 怎么用简便方法计算?_数学解答

0.81乘0.81乘99 怎么用简便方法计算?

人气：437 ℃　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