用简便方法计算下面各题,急,

问题描述:

用简便方法计算下面各题,急,
(15/2+35/4)×2/5
5/9×20-10/9
6/5×6/7-6/7÷5
34/35×34
(2/3-1/2+1/4)÷1/36
6/19×13/17+4/19×6/17

1;!15/2+35/4!*2/5=!3/2+7/4!*2=3+3.5=7
2 =5/9*20-5/9*2=5/9*18=10
3 =6/5*6/7-6/5*1/7=6/5*5/7=6/7
4 =34/35*35-34/35=34-34/35=33又1/35
5 !2/3-1/4!*36=24-9=15
6 =6/19*13/17+6/19*4/17=6/19