2/1x15/1+3/1x2/1怎样简便列式计算?

问题描述:

2/1x15/1+3/1x2/1怎样简便列式计算?

2/1x15/1+3/1x2/1
=2/1*(15/1+3/1)
=2/1*5/2
=5/1