题目内容
| 脱式计算。 | ||||||
|
| (1)5.7+3.8+7.4 =9.5+7.4 =16.9 |
(2)53.8+61.3-39.8 =115.1-39.8 =75.3 |
(3)69-36.4+20.9 =32.6+20.9 =53.5 |
| (4)94.13-(28.9+21.4) =94.13-50.3 =43.53 |
(5)72.2-(32.46-18.6) =72.2-13.86 =58.34 |
(6)14.38+45.6-30.69 =59.98-30.69 =29.29 |
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