题目内容
解方程
1-
x=![数学公式](http://thumb.1010pic.com/pic5/latex/9777.png)
=
.
解:(1)1-
x=
,
1-
x+
x-
=
+
x-
,
=
x,
x×
=
×
,
x=
;
(2)
,
5x=1.75×3,
5x÷5=1.75×3÷5,
x=1.05.
分析:(1)利用等式的性质,两边同时加上
x-
可得:1-
=
x,把等式的两边交换位置可得:
x=1-
,再利用等式的性质两边同时乘以
即可;
(2)利用比例的基本性质将比例式化成一元一次方程,再利用等式的性质即可解答.
点评:此题考查了利用等式的性质解方程和利用比例的基本性质解比例的灵活应用.
![](http://thumb.1010pic.com/pic5/latex/14.png)
![](http://thumb.1010pic.com/pic5/latex/9777.png)
1-
![](http://thumb.1010pic.com/pic5/latex/14.png)
![](http://thumb.1010pic.com/pic5/latex/14.png)
![](http://thumb.1010pic.com/pic5/latex/9777.png)
![](http://thumb.1010pic.com/pic5/latex/9777.png)
![](http://thumb.1010pic.com/pic5/latex/14.png)
![](http://thumb.1010pic.com/pic5/latex/9777.png)
![](http://thumb.1010pic.com/pic5/latex/847.png)
![](http://thumb.1010pic.com/pic5/latex/14.png)
![](http://thumb.1010pic.com/pic5/latex/14.png)
![](http://thumb.1010pic.com/pic5/latex/1231.png)
![](http://thumb.1010pic.com/pic5/latex/847.png)
![](http://thumb.1010pic.com/pic5/latex/1231.png)
x=
![](http://thumb.1010pic.com/pic5/latex/2579.png)
(2)
![](http://thumb.1010pic.com/pic5/latex/517113.png)
5x=1.75×3,
5x÷5=1.75×3÷5,
x=1.05.
分析:(1)利用等式的性质,两边同时加上
![](http://thumb.1010pic.com/pic5/latex/14.png)
![](http://thumb.1010pic.com/pic5/latex/9777.png)
![](http://thumb.1010pic.com/pic5/latex/9777.png)
![](http://thumb.1010pic.com/pic5/latex/14.png)
![](http://thumb.1010pic.com/pic5/latex/14.png)
![](http://thumb.1010pic.com/pic5/latex/9777.png)
![](http://thumb.1010pic.com/pic5/latex/1231.png)
(2)利用比例的基本性质将比例式化成一元一次方程,再利用等式的性质即可解答.
点评:此题考查了利用等式的性质解方程和利用比例的基本性质解比例的灵活应用.
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目
解方程
![]() ![]() | 1-![]() ![]() | 10:x=4.5:0.8. |