P
pl09


cho a,b,c dương thỏa mãn: a+b+c=3.
Chứng minh rằng:
$\sqrt{\dfrac{a+b}{c+ab}}+\sqrt{\dfrac{b+c}{a+bc}}+\sqrt{\dfrac{c+a}{b+ac}} \ge 3$
Chứng minh rằng:
$\sqrt{\dfrac{a+b}{c+ab}}+\sqrt{\dfrac{b+c}{a+bc}}+\sqrt{\dfrac{c+a}{b+ac}} \ge 3$
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