题目内容
当a=________时,式子(29-8a)×
的值是10,当a=________时,式子(29-8a)÷
的值是45.
![](http://thumb.1010pic.com/pic5/latex/13.png)
![](http://thumb.1010pic.com/pic5/latex/96.png)
分析:求a的值是什么时,是式子(29-8a)×
![](http://thumb.1010pic.com/pic5/latex/335.png)
![](http://thumb.1010pic.com/pic5/latex/335.png)
![](http://thumb.1010pic.com/pic5/latex/14.png)
![](http://thumb.1010pic.com/pic5/latex/14.png)
解答:(1)(29-8a)×
![](http://thumb.1010pic.com/pic5/latex/335.png)
29-8a=10×
![](http://thumb.1010pic.com/pic5/latex/259.png)
29-25=8a,
4÷8=a,
a=
![](http://thumb.1010pic.com/pic5/latex/13.png)
(2)(29-8a)÷
![](http://thumb.1010pic.com/pic5/latex/14.png)
29-8a=45×
![](http://thumb.1010pic.com/pic5/latex/14.png)
29-27=8a,
a=2÷8,
a=
![](http://thumb.1010pic.com/pic5/latex/96.png)
故答案为:
![](http://thumb.1010pic.com/pic5/latex/13.png)
![](http://thumb.1010pic.com/pic5/latex/96.png)
点评:本题主要考查了学生根据等式的性质解方程的能力.
![](http://thumb2018.1010pic.com/images/loading.gif)
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