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Với x>1:y>0
CMR $\frac{1}{(x-1)^3} +\frac{(x-1)^3}{y^3}+\frac{1}{y^3}$ \geq $3(\frac{3-2x}{x-1}+\frac{x}{y})$
CMR $\frac{1}{(x-1)^3} +\frac{(x-1)^3}{y^3}+\frac{1}{y^3}$ \geq $3(\frac{3-2x}{x-1}+\frac{x}{y})$
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