tìm GTNN

K

kisihoangtoc

Phân tích $M=x^2-5x+y^2+xy-4y+2016=(x+\frac{y}{2}-\frac{5}{2})^2+\frac{3}{4}(y-1)^2+2009$\geq$2009$
Vậy $M_{min}=2009$\Leftrightarrow$(x;y)=(2;1)$
 
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