Question

用简便方法计算下面各题

用简便方法计算下面各题:（11.7+9.9)÷0.9=?

13.95÷2-3.95×0.5=?

0.42×160+36×1.6-31×3.2=？

Answer 1

(11.7+9.9)÷0.9=?
11.7÷0.9+9.9÷0.9＝
13+11＝24

13.95÷2-3.95×0.5=?
13.95÷2-3.95÷2＝
（13.95-3.95）÷2＝5

0.42×160+36×1.6-31×3.2=？
42×1.6+36×1.6-62×1.6＝
（42+36-62）×1.6＝25.6

Answer 2

（11.7+9.9)÷0.9
=(11.7+9.9)*(10/9)
=11.7*(10/9)+9.9*(10/9)
=13+11
=24;

13.95÷2-3.95×0.5
=13.95*0.5-3.95*0.5
=(13.95-3.95)*0.5
=10*0.5
=5;

0.42×160+36×1.6-31×3.2
=42*1.6+36*1.6-62*1.6
=1.6*(42+36-62)
=1.6*16
=25.6.

Answer 3

最简单的，计算器