+ = | + = | - = | 10-4.8-3.2= |
1- = | 0.5×0.2÷0.5×0.2= | 1- - = | - = |
| 0.125×0.25×32= | 7-6.38= | + = | 3.9+6.1-3.9+6.1= |
解: + = , | + = , | - = , | 10-4.8-3.2=2, |
1- = , | 0.5×0.2÷0.5×0.2=0.04, | 1- - = , | - = , |
| 0.125×0.25×32=1, | 7-6.38=0.62, | + = , | 3.9+6.1-3.9+6.1=12.2. |
分析:根据分数和小数加减乘除的计算方法进行计算即可;0.5×0.2÷0.5×0.2按照从左向右的顺序计算;0.125×0.25×32,把32拆成8×4,根据乘法交换律和结合律进行计算.
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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