题目
题型:不详难度:来源:
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100426-12262.png)
解析
解:∵∠ACB=90°,CE是中线,CE=6,
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100426-76463.png)
∴BA=2CE=12,
∴S△ACB=
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100426-27043.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100426-27043.png)
故答案为:30cm2.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100420-64396.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100420-38554.png)
如图,已知
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100411-10024.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100412-27261.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100412-12552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100412-84975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100412-70025.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100412-73810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100353-76862.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100354-15332.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100354-33284.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100354-63389.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100354-23029.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100353-76862.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100354-15332.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100354-33284.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100354-34728.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100354-67173.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100354-99350.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100355-75302.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100355-37950.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100355-75302.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100355-65464.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100355-37950.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100355-30865.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100355-79056.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100355-60143.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100355-99346.gif)
(1)请在图中找出两对相似而不全等的三角形,并选取其中一对加以证明.
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100356-33318.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100356-60686.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100356-60686.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100336-73493.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100336-48765.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100337-22120.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100337-98286.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100337-25592.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100337-58857.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100338-13855.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100338-18764.jpg)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100338-86685.gif)
(2)求过点O,G,A的抛物线的解析式和对称轴;
(3)在抛物线的对称轴上是否存在点P,使得
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100338-64573.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100339-29630.gif)
已知
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100330-93670.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100331-47041.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100331-39050.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100331-96830.gif)
解:∵
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103100331-96830.gif)
A. ∴ ![]() | B. ∴ ![]() | C. ∴△ABC是直角三角形 | D. 问:(1)上述解题过程,从哪一步开始出现错误?请写出该步的代号; (2)错误的原因为; (3)本题正确的结论是; |
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