| 3.9+61= | 15÷1%= | 9.1-1.9= | 7.2÷0.6= |
| 1+30%= | 0.125×8= | 0.32= | 7π= |
+ = | ÷ = | - - = | + ×14= |
| 3.9+61=64.9, | 15÷1%=1500, | 9.1-1.9=7.2, | 7.2÷0.6=12, |
| 1+30%=1.3, | 0.125×8=1, | 0.32=0.09, | 7π=21.98, |
+ = , | ÷ = , | - - = , | + ×14=2 . |
分析:0.32=0.3×0.3,由此求解;
7π,把π看作近似值3.14,然后乘上7即可;
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根据减法的性质简算;
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×14先算乘法,再算加法;其它题目根据运算法则直接求解.
点评:口算题目,要求快速准确,能用简便方法的要用简便方法.
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