题目内容
若已知一个梯形的上底长为
cm,下底长为
cm,高为2
cm,则这个梯形的面积为________.
14cm2
分析:根据梯形的面积公式列式,再根据二次根式的加法与乘法计算进行计算即可得解.
解答:这个梯形的面积=
[(
-
)+(
+
)]×2![](http://thumb.1010pic.com/pic5/latex/4546.png)
=
(
-
+
+
)×2![](http://thumb.1010pic.com/pic5/latex/4546.png)
=
×2
×2![](http://thumb.1010pic.com/pic5/latex/4546.png)
=14cm2.
故答案为:14cm2.
点评:本题考查了二次根式的应用,主要利用了二次根式的加法与乘法运算,比较简单.
分析:根据梯形的面积公式列式,再根据二次根式的加法与乘法计算进行计算即可得解.
解答:这个梯形的面积=
![](http://thumb.1010pic.com/pic5/latex/13.png)
![](http://thumb.1010pic.com/pic5/latex/4546.png)
![](http://thumb.1010pic.com/pic5/latex/53.png)
![](http://thumb.1010pic.com/pic5/latex/4546.png)
![](http://thumb.1010pic.com/pic5/latex/53.png)
![](http://thumb.1010pic.com/pic5/latex/4546.png)
=
![](http://thumb.1010pic.com/pic5/latex/13.png)
![](http://thumb.1010pic.com/pic5/latex/4546.png)
![](http://thumb.1010pic.com/pic5/latex/53.png)
![](http://thumb.1010pic.com/pic5/latex/4546.png)
![](http://thumb.1010pic.com/pic5/latex/53.png)
![](http://thumb.1010pic.com/pic5/latex/4546.png)
=
![](http://thumb.1010pic.com/pic5/latex/13.png)
![](http://thumb.1010pic.com/pic5/latex/4546.png)
![](http://thumb.1010pic.com/pic5/latex/4546.png)
=14cm2.
故答案为:14cm2.
点评:本题考查了二次根式的应用,主要利用了二次根式的加法与乘法运算,比较简单.
![](http://thumb2018.1010pic.com/images/loading.gif)
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