题目内容
求未知数X:
x=![数学公式](http://thumb.1010pic.com/pic5/latex/365.png)
x÷
=![数学公式](http://thumb.1010pic.com/pic5/latex/729.png)
x=15
x÷
=
.
解:(1)
x=
,
x
=
,
x=1
;
(2)x÷
=
,
x
=
,
x=
;
(3)
x=15,
x
=15
,
x=24;
(4)x÷
=
,
x÷
×
=
×
,
x=
.
分析:(1)依据等式的性质,方程两边同时除以
求解,
(2)依据等式的性质,方程两边同时乘
求解,
(3)依据等式的性质,方程两边同时除以
求解,
(4)依据等式的性质,方程两边同时乘
求解.
点评:本题主要考查学生依据等式的性质解方程的能力,解方程时注意对齐等号.
![](http://thumb.1010pic.com/pic5/latex/168.png)
![](http://thumb.1010pic.com/pic5/latex/365.png)
![](http://thumb.1010pic.com/pic5/latex/168.png)
![](http://thumb.1010pic.com/pic5/latex/163365.png)
![](http://thumb.1010pic.com/pic5/latex/249563.png)
x=1
![](http://thumb.1010pic.com/pic5/latex/112.png)
(2)x÷
![](http://thumb.1010pic.com/pic5/latex/168.png)
![](http://thumb.1010pic.com/pic5/latex/729.png)
x
![](http://thumb.1010pic.com/pic5/latex/313849.png)
![](http://thumb.1010pic.com/pic5/latex/313850.png)
x=
![](http://thumb.1010pic.com/pic5/latex/12290.png)
(3)
![](http://thumb.1010pic.com/pic5/latex/5192.png)
![](http://thumb.1010pic.com/pic5/latex/5192.png)
![](http://thumb.1010pic.com/pic5/latex/179631.png)
![](http://thumb.1010pic.com/pic5/latex/179631.png)
x=24;
(4)x÷
![](http://thumb.1010pic.com/pic5/latex/3982.png)
![](http://thumb.1010pic.com/pic5/latex/9777.png)
x÷
![](http://thumb.1010pic.com/pic5/latex/3982.png)
![](http://thumb.1010pic.com/pic5/latex/3982.png)
![](http://thumb.1010pic.com/pic5/latex/9777.png)
![](http://thumb.1010pic.com/pic5/latex/3982.png)
x=
![](http://thumb.1010pic.com/pic5/latex/2581.png)
分析:(1)依据等式的性质,方程两边同时除以
![](http://thumb.1010pic.com/pic5/latex/168.png)
(2)依据等式的性质,方程两边同时乘
![](http://thumb.1010pic.com/pic5/latex/168.png)
(3)依据等式的性质,方程两边同时除以
![](http://thumb.1010pic.com/pic5/latex/5192.png)
(4)依据等式的性质,方程两边同时乘
![](http://thumb.1010pic.com/pic5/latex/3982.png)
点评:本题主要考查学生依据等式的性质解方程的能力,解方程时注意对齐等号.
![](http://thumb2018.1010pic.com/images/loading.gif)
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