4700除以5除以4 104乘31简便算法.速求.

问题描述:

4700除以5除以4 104乘31简便算法.速求.

4700÷5÷4
=4700÷(5*4)
=4700÷20
=235
104*31
=(100+4)*31
=100*31+4*31
=3100+124
=3224