C
conheo113


cho a,b,c>0 và ac + bc +1 \leq $\dfrac{3c}{2}$. c/m rằng
P = a + b + $c^2 + \dfrac{1}{a^2} + \dfrac{1}{b^2} + \dfrac{1}{c^2}$\geq $\dfrac{27}{2}$
P = a + b + $c^2 + \dfrac{1}{a^2} + \dfrac{1}{b^2} + \dfrac{1}{c^2}$\geq $\dfrac{27}{2}$
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