| 3.82-1.9= | = | 0.37+4.8= | 0.9×99+0.9= |
| 3.14÷0.1= | ÷3= | -0.004= | = |
| 0.25×40= | 7.2× = | 30% = | = |
| 解:3.82-1.9=1.92, | = , | 0.37+4.8=5.17, | 0.9×99+0.9=90, |
| 3.14÷0.1=31.4, | ÷3= , | -0.004=0.396, | =0, |
| 0.25×40=10, | 7.2× =0.8, | 30% =0.5, | =0. |
分析:根据小数和分数加减乘除的计算方法进行计算即可;0.9×99+0.9根据乘法分配律进行简算.
点评:口算时,注意运算符号和数据,然后再进一步计算即可.
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