题目

脱式计算题--能简便的要简便
7/12*1/5+3/12除以5
5/9*6/25除以3/10
12*(3/4-1/24)

提问时间：2020-10-31

答案

7/12*1/5+3/12除以5
=7/12*1/5+3/12*1/5
=1/5*(7/12+3/12)
=1/5*5/6
=1/6
5/9*6/25除以3/10
=5/9*6/25*10/3
=4/9
12*(3/4-1/24)
=12*3/4-12*1/24
=9-1/2
=8又1/2