Question

15.6-3.4*2.55简便计算

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

Answer 1

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