题目内容
解方程
![]() | ![]() ![]() ![]() |
解:(1)
X+0.5=1.2,
X+0.5-0.5=1.2-0.5,
X=0.7,
X×4=0.7×4,
X=2.8;
(2)
X-
=
,
X-
+
=
+
,
X=
,
X×
=
×
,
X=
.
分析:(1)根据等式的性质,两边同减去0.5,再同乘4即可;
(2)根据等式的性质,两边同加上
,再同乘
即可.
点评:在解方程时应根据等式的性质,即等式两边同加上、同减去、同乘上或同除以某一个数(0除外),等式的两边仍相等,同时注意“=”上下要对齐.
![](http://thumb.1010pic.com/pic5/latex/96.png)
![](http://thumb.1010pic.com/pic5/latex/96.png)
![](http://thumb.1010pic.com/pic5/latex/96.png)
![](http://thumb.1010pic.com/pic5/latex/96.png)
X=2.8;
(2)
![](http://thumb.1010pic.com/pic5/latex/4442.png)
![](http://thumb.1010pic.com/pic5/latex/168.png)
![](http://thumb.1010pic.com/pic5/latex/155.png)
![](http://thumb.1010pic.com/pic5/latex/4442.png)
![](http://thumb.1010pic.com/pic5/latex/168.png)
![](http://thumb.1010pic.com/pic5/latex/168.png)
![](http://thumb.1010pic.com/pic5/latex/155.png)
![](http://thumb.1010pic.com/pic5/latex/168.png)
![](http://thumb.1010pic.com/pic5/latex/4442.png)
![](http://thumb.1010pic.com/pic5/latex/33.png)
![](http://thumb.1010pic.com/pic5/latex/4442.png)
![](http://thumb.1010pic.com/pic5/latex/3086.png)
![](http://thumb.1010pic.com/pic5/latex/33.png)
![](http://thumb.1010pic.com/pic5/latex/3086.png)
X=
![](http://thumb.1010pic.com/pic5/latex/36671.png)
分析:(1)根据等式的性质,两边同减去0.5,再同乘4即可;
(2)根据等式的性质,两边同加上
![](http://thumb.1010pic.com/pic5/latex/168.png)
![](http://thumb.1010pic.com/pic5/latex/3086.png)
点评:在解方程时应根据等式的性质,即等式两边同加上、同减去、同乘上或同除以某一个数(0除外),等式的两边仍相等,同时注意“=”上下要对齐.
![](http://thumb2018.1010pic.com/images/loading.gif)
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