题目内容
| 计算: 3.2×2= |
1.2×0.3= | 0.3×0.3= | 0.8×6= |
| 6×0.04= | 1.3×5= | 1.5×4= | 2.1×7= |
分析:根据小数乘法的计算方法进行计算.
解答:解:
| 3.2×2=6.4, | 1.2×0.3=0.36, | 0.3×0.3=0.09, | 0.8×6=4.8, |
| 6×0.04=0.24, | 1.3×5=6.5, | 1.5×4=6, | 2.1×7=14.7. |
点评:口算时,注意运算符号和数据,然后再进一步计算.
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计算:
| 3.2×2= | 1.2×0.3= | 0.3×0.3= | 0.8×6= |
| 6×0.04= | 1.3×5= | 1.5×4= | 2.1×7= |
下面各题怎样简便就怎样计算.
| 3.2×2.5×12.5 | 0.25÷( |
| 7÷〔 | 5.7×0.25+6.8×25%-8.5× |