J
jollykute0608
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
1. tìm gtnn của M= $x^2$ + $y^2$ - xy -x + y +1
2. tìm x,y nguyên sao cho $x^2$ + 2xy + x + $y^2$ + 4y = 0
2. tìm x,y nguyên sao cho $x^2$ + 2xy + x + $y^2$ + 4y = 0
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