神机妙算细又巧（能简算的要简算）78÷5+78÷21.05×（3.8-0.8）÷6.30.37×99+3.7×0.1560×35+0.6×236.5+312×60%920÷[12×（25+45）]．

Question

神机妙算细又巧（能简算的要简算）
(7)/(8)÷5+(7)/(8)÷2       
1.05×（3.8-0.8）÷6.3     
0.37×99+3.7×0.1
560×(3)/(5)+0.6×236.5+3(1)/(2)×60%                 
(9)/(20)÷[(1)/(2)×（(2)/(5)+(4)/(5)）]．

Answer 1

（1）(7)/(8)÷5+(7)/(8)÷2
=(7)/(8)×(1)/(5)+(7)/(8)×(1)/(2)
=(7)/(8)×（(1)/(5)+(1)/(2)）
=(7)/(8)×(7)/(10)
=(49)/(80)；

（2）1.05×（3.8-0.8）÷6.3
=1.05×3÷6.3
=3.15÷6.3
=0.5；

（3）0.37×99+3.7×0.1
=3.7×9.9+3.7×0.1
=3.7×（9.9+0.1）
=3.7×10
=37；

（4）560×(3)/(5)+0.6×236.5+3(1)/(2)×60%
=560×0.6+0.6×236.5+3.5×0.6
=（560+236.5+3.5）×0.6
=0.6×800
=480；

（5）(9)/(20)÷[(1)/(2)×（(2)/(5)+(4)/(5)）]
=(9)/(20)÷[(1)/(2)×(6)/(5)]
=(9)/(20)÷(3)/(5)
=(3)/(4)．