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kienduc_vatli
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
1./ cho x,y thõa mãn $5x^2+\frac{5}{4}y^2-3xy+\frac{2}{3}x+\frac{1}{3}y+\frac{1}{9}=0$
vậy 3x+3y=?
2/ cho x,y,z thõa mãn $x+y+z+xy+yz+zx=6$.GTNN của$P=x^2+y^2+z^2$
vậy 3x+3y=?
2/ cho x,y,z thõa mãn $x+y+z+xy+yz+zx=6$.GTNN của$P=x^2+y^2+z^2$
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