(Toán 9) GPT

P

phankyanhls2000

[TEX]Q=(x-1)(y-1)(z-1) \geq \frac{(x+y+x-3)^3}{27}=\frac{(1-3)^3}{27}=\frac{-8}{27} \rightarrow Q \geq \frac{-8}{27}[/TEX]
 
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