求一道证明题,有图,
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求一道证明题,有图,
![](http://img.wesiedu.com/upload/5/6d/56d4dfa51146b83ae5cad09a62a1ab09.jpg)
![](http://img.wesiedu.com/upload/5/6d/56d4dfa51146b83ae5cad09a62a1ab09.jpg)
![求一道证明题,有图,](/uploads/image/z/17566640-8-0.jpg?t=%E6%B1%82%E4%B8%80%E9%81%93%E8%AF%81%E6%98%8E%E9%A2%98%2C%E6%9C%89%E5%9B%BE%2C)
证明:
因为(1+1/x)(1+1/y)
=(x+y+xy)/(xy)
=(2+xy)/(xy)
=2/(xy)+1
由(1+1/x)(1+1/y)>=9可得
xy
因为(1+1/x)(1+1/y)
=(x+y+xy)/(xy)
=(2+xy)/(xy)
=2/(xy)+1
由(1+1/x)(1+1/y)>=9可得
xy