题目
题型:解答题难度:一般来源:北京竞赛题
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041405-25031.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041405-60209.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041406-85257.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041406-11798.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041406-34453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041406-17429.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041406-53123.png)
∴(
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041407-17215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041407-13811.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041407-45230.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041408-53830.png)
即(
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041408-19133.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041408-91867.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041408-62352.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041408-40244.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041409-72678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041409-91618.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041409-86632.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041409-88150.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041409-22068.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041410-37291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041410-71984.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041410-50281.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041410-38054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041410-67672.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041357-71306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041356-69780.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041357-13383.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041354-32124.png)
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