题目内容
20×60= | 4.8-3.9= | ![]() ![]() | 1.25×0.8= |
![]() ![]() | 18÷2%= | (![]() ![]() | ![]() ![]() ![]() ![]() |
117÷31≈ | 19.685×30.27≈ |
解:
20×60=1200, | 4.8-3.9=0.9, | ![]() ![]() ![]() | 1.25×0.8=1, |
![]() ![]() | 18÷2%=900, | (![]() ![]() | ![]() ![]() ![]() ![]() ![]() |
117÷31≈4, | 19.685×30.27≈600. |
故答案为:1200,0.9,,1,2,900,14,
,4,600.
分析:本题根据整数、小数、分数的乘法与除法的运算法则计算即可.
4.8-3.9可据凑整法计算;
(
![](http://thumb.1010pic.com/pic5/latex/168.png)
![](http://thumb.1010pic.com/pic5/latex/13.png)
![](http://thumb.1010pic.com/pic5/latex/189129.png)
![](http://thumb.1010pic.com/pic5/latex/13.png)
![](http://thumb.1010pic.com/pic5/latex/189129.png)
![](http://thumb.1010pic.com/pic5/latex/13.png)
117÷31可按120÷30估算,19.685×30.27可按20×30估算.
点评:完成本题要注意分析式中数据的特点,能简便计算的要简便计算.
![](http://thumb2018.1010pic.com/images/loading.gif)
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