题目内容
直接写得数,看谁快又准.![]() | 5-0.25+0.75=________; | 9-0.09=________; | 0.4×16×0.25=________; |
![]() ![]() ![]() | 4.5×102=________; | 23.9÷8≈________; | 1÷![]() ![]() |
0.42-0.32=________; | 13×(2+![]() | 7×![]() ![]() | 0.9+99×0.9=________. |
![](http://thumb.1010pic.com/pic5/latex/1154.png)
![](http://thumb.1010pic.com/pic5/latex/8.png)
![](http://thumb.1010pic.com/pic5/latex/365.png)
![](http://thumb.1010pic.com/pic5/latex/42180.png)
分析:5-0.25+0.75运用加法交换律和结合律简算;
0.4×16×0.25运用乘法交换律简算;
![](http://thumb.1010pic.com/pic5/latex/168.png)
![](http://thumb.1010pic.com/pic5/latex/13.png)
![](http://thumb.1010pic.com/pic5/latex/7.png)
![](http://thumb.1010pic.com/pic5/latex/602.png)
![](http://thumb.1010pic.com/pic5/latex/14.png)
4.5×102先把102分解成100+2,再运用乘法分配律简算;
0.42-0.32=0.5×0.4-0.3×0.3×0.3,由此求解;
13×(2+
![](http://thumb.1010pic.com/pic5/latex/28406.png)
7×
![](http://thumb.1010pic.com/pic5/latex/847.png)
![](http://thumb.1010pic.com/pic5/latex/847.png)
解答:
![]() ![]() | 5-0.25+0.75=5.5; | 9-0.09=8.91; | 0.4×16×0.25=1.6; |
![]() ![]() ![]() ![]() | 4.5×102=459; | 23.9÷8≈3; | 1÷![]() ![]() ![]() |
0.42-0.32=0.07; | 13×(2+![]() | 7×![]() ![]() ![]() | 0.9+99×0.9=90 |
![](http://thumb.1010pic.com/pic5/latex/1154.png)
![](http://thumb.1010pic.com/pic5/latex/8.png)
![](http://thumb.1010pic.com/pic5/latex/365.png)
![](http://thumb.1010pic.com/pic5/latex/42180.png)
点评:完成本题要细心分析式中数据,能简便计算的要简便计算.
![](http://thumb2018.1010pic.com/images/loading.gif)
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