题目内容
用递等式计算（能简算的要简算）
| 20.9+10.2÷（5.2-3.5） | 9.4×[1.28-（1.54-0.31）] |
| 10.64+7.65×2.4+11.76 | 15.52-4.3-5.7 |
| 9.83×（3.8-2.3）+1.5×6.17 | [（6.1-4.6）÷0.8-1]×0.4． |
（1）20.9+10.2÷（5.2-3.5）
=20.9+10.2÷1.7
=20.9+6
=26.9
（2）9.4×[1.28-（1.54-0.31）]
=9.4×[1.28-1.23]
=9.4×0.05
=0.47
（3）10.64+7.65×2.4+11.76
=10.64+18.36+11.76
=（10.64+18.36）+11.76
=29+11.76
=40.76
（4）15.52-4.3-5.7
=15.52-（4.3+5.7）
=15.52-10
=5.52
（5）9.83×（3.8-2.3）+1.5×6.17
=9.83×1.5+9.255
=14.745+9.255
=24
（6）[（6.1-4.6）÷0.8-1]×0.4
=[1.5÷0.8-1]×0.4
=[1.875-1]×0.4
=0.875×0.4
=0.35
=20.9+10.2÷1.7
=20.9+6
=26.9
（2）9.4×[1.28-（1.54-0.31）]
=9.4×[1.28-1.23]
=9.4×0.05
=0.47
（3）10.64+7.65×2.4+11.76
=10.64+18.36+11.76
=（10.64+18.36）+11.76
=29+11.76
=40.76
（4）15.52-4.3-5.7
=15.52-（4.3+5.7）
=15.52-10
=5.52
（5）9.83×（3.8-2.3）+1.5×6.17
=9.83×1.5+9.255
=14.745+9.255
=24
（6）[（6.1-4.6）÷0.8-1]×0.4
=[1.5÷0.8-1]×0.4
=[1.875-1]×0.4
=0.875×0.4
=0.35
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