| 直接写出得数. 1.57+3.03= | 13.7-5.6= | 7.5÷0.1= | 0.25×8= |
×12= | ÷ = | × = | - = |
| 3.14×20= | 2× = | 6.4÷0.4= | 2-1.05= |
| 4×3.14= | 300×0.01%= | × = | 0.42÷8= |
| 解:1.57+3.03=4.6, | 13.7-5.6=8.1, | 7.5÷0.1=75, | 0.25×8=2, |
×12=8, | ÷ = , | × = , | - = , |
| 3.14×20=62.8, | 2× = , | 6.4÷0.4=16, | 2-1.05=0.95, |
| 4×3.14=12.56, | 300×0.01%=0.03, | × = , | 0.42÷8=0.02. |
分析:按照计算的法则直接计算,小数的计算要注意小数点的位数,分数的计算要注意把结果化成最简分数;0.42÷8=0.4×0.4÷8由此求解.
点评:本题考查了基本的计算,计算时要细心,多积累经验,逐步提高运算的速度和准确性.
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