题目内容
列式计算:
一个数的
比它的25%多7,这个数是多少?(用方程)
加上
除以
的商,所得的和乘
,积是多少?
解:(1)设这个数是x,
x-25%x=7,
x=7,
x
=7
,
x=14;
(2)(![](http://thumb.1010pic.com/pic5/latex/602.png)
)×
,
=(
)×
,
=
,
=
.
分析:(1)设这个数是x,依据题意可列方程:
x-25%x=7,依据等式的性质解答即可,
(2)先求出
的商,再与
相加,用求得的和乘
即可解答.
点评:解答此类题目的关键是:找出数量间的关系,代入数据即可解答.
![](http://thumb.1010pic.com/pic5/latex/365.png)
![](http://thumb.1010pic.com/pic5/latex/13.png)
![](http://thumb.1010pic.com/pic5/latex/13.png)
![](http://thumb.1010pic.com/pic5/latex/182079.png)
![](http://thumb.1010pic.com/pic5/latex/182079.png)
x=14;
(2)(
![](http://thumb.1010pic.com/pic5/latex/602.png)
![](http://thumb.1010pic.com/pic5/latex/490997.png)
![](http://thumb.1010pic.com/pic5/latex/96.png)
=(
![](http://thumb.1010pic.com/pic5/latex/490998.png)
![](http://thumb.1010pic.com/pic5/latex/96.png)
=
![](http://thumb.1010pic.com/pic5/latex/490999.png)
=
![](http://thumb.1010pic.com/pic5/latex/335.png)
分析:(1)设这个数是x,依据题意可列方程:
![](http://thumb.1010pic.com/pic5/latex/365.png)
(2)先求出
![](http://thumb.1010pic.com/pic5/latex/491000.png)
![](http://thumb.1010pic.com/pic5/latex/602.png)
![](http://thumb.1010pic.com/pic5/latex/96.png)
点评:解答此类题目的关键是:找出数量间的关系,代入数据即可解答.
![](http://thumb2018.1010pic.com/images/loading.gif)
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