P
pl09


Cho a,b,c dương thỏa mãn: $a^{2}+b^{2}+c^{2}=3$
Chứng minh rằng:
$\dfrac{1}{3-ab}+\dfrac{1}{3-bc}+\dfrac{1}{3-ac} \ge \dfrac{3}{2}$
Chứng minh rằng:
$\dfrac{1}{3-ab}+\dfrac{1}{3-bc}+\dfrac{1}{3-ac} \ge \dfrac{3}{2}$
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