21.6乘9.9简便的计算

问题描述:

21.6乘9.9简便的计算

=21.6*(10-0.1)
=21.6*10-21.6*0.1
=216-2.16
=215.84

21.6*9.9
=21.6*(10-0.1)
=216-2.16
=213.84