D
danhtuan234
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
cho x,y la hai so khong am .Tim GTLN ,GTNN cua:
[TEX]F=\frac{(x-y)(1-xy)}{(1+x)^2(1+y)^2}[/TEX]
[TEX]F=\frac{(x-y)(1-xy)}{(1+x)^2(1+y)^2}[/TEX]
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