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Cho $P=\frac{3}{xy+yz+zx}-\frac{4}{x^3+y^3+z^3}$

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dodinhthang98

dodinhthang98

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Cho $\frac{1}{x}+\frac{1}{y}+\frac{1}{z} =\frac{10}{x+y+z}$ và $x,y,z>0$ Tìm GTLN:

$P=\frac{3}{xy+yz+zx}-\frac{4}{x^3+y^3+z^3}$






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