题目内容
| 脱式计算。(能简算的要简算) | ||||
|
| （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 |
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