9.9乘9.81简便计算
问题描述:
9.9乘9.81简便计算
答
9.9×9.81
=(10-0.1)×9.81
=10×9.81-0.1×9.81
=98.1-0.981
=97.1+1-0.981
=97.1+(1-0.981)
=97.1+0.019
=97.119