3/4*2 2/5*2简便计算

问题描述:

3/4*2 2/5*2简便计算
还有7/11-8/7*5/8+5/14 (1/3*6/7-1/14)除以4/15

3/4*2又2/5*2
=3/4*2*12/5
=3/2*12/5
=18/5
=3.6
7/11-8/7*5/8+5/14
=7/11-(5/7-5/14)
=7/11-7/14
=21/154
(1/3*6/7-1/14)÷4/15
=(2/7-1/14)÷4/15
=3/14×15/4
=45/56