下面各题怎样简便就怎样算．87×386517÷9+19×1217215÷[1-（15+13）]5.37-1.47-2.53157+1112+67+112×130.25×（4.8-7.5÷3）

Question

下面各题怎样简便就怎样算．

87×(3)/(86)	(5)/(17)÷9+(1)/(9)×(12)/(17)	(2)/(15)÷[1-（(1)/(5)+(1)/(3)）]
5.37-1.47-2.53	(15)/(7)+(11)/(12)+(6)/(7)+(1)/(12)×13	0.25×（4.8-7.5÷3）

Answer 1

（1）87×(3)/(86)
=86×(3)/(86)+1×(3)/(86)
=3+(3)/(86)
=3(3)/(86)；

（2）(5)/(17)÷9+(1)/(9)×(12)/(17)
=（(5)/(17)+(12)/(17)）×(1)/(9)
=1×(1)/(9)
=(1)/(9)；

（3）(2)/(15)÷[1-（(1)/(5)+(1)/(3)）]
=(2)/(15)÷[1-(8)/(15)]
=(2)/(15)÷(7)/(15)
=(2)/(7)；

（4）5.37-1.47-2.53
=5.37-（1.47+2.53）
=5.37-4
=1.37；

（5）(15)/(7)+(11)/(12)+(6)/(7)+(1)/(12)×13
=（(15)/(7)+(6)/(7)）+（(11)/(12)+(1)/(12)×13）
=3+2
=5；

（6）0.25×（4.8-7.5÷3）
=0.25×（4.8-2.5）
=0.25×2.3
=0.575．