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truongduong9083

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1. $P = \dfrac{x}{1+z}+\dfrac{y}{1+z}+\dfrac{y}{1+x}+ \dfrac{z}{1+x}+\dfrac{z}{1+y}+\dfrac{x}{1+y}\leq \dfrac{x}{x+z}+\dfrac{z}{z+x}+\dfrac{y}{y+z}+ \dfrac{z}{z+y}+\dfrac{y}{y+x}+\dfrac{x}{x+y} = 3$
Dấu bằng xảy ra khi x = y = z = 1
2. $P \geq 0$
Dấu bằng xảy ra khi a = b = c = 0
 
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