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Tìm min:

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#1
drawmydream

drawmydream

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Cho:$\left\{\begin{matrix} x, y, z >1& & & & &  \\ x+y+z = xyz& & & & & \end{matrix}\right.
Tìm min biểu thức:
S = $\frac{x-1}{y2}$ + $\frac{y-1}{z2}$ + $\frac{z-1}{x2}$







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