问题
计算题
| 脱式计算。(能简算的要简算) | ||||
|
答案
| （1）72-16.8÷0.4 +2.1 | |
| =72-42+2.1 | |
| =32.1 | |
| （2）23.6×0.75+0.25×23 .6 | |
| =23.6×（0.75+0.25） | |
| =23.6×1 | |
| =23.6 | |
| （3）（2.3÷0.46-4.5）÷0.25 | |
| =（5-4.5）÷0.25 | |
| = 0.5÷0.25 | |
| = 2 | （3）37.2÷ [54.7-105.4 ×（0.45 ÷ 0.9）] |
=37.2÷[54.7-105.4×0.5]
=37.2÷2
=18.6