CMR:
1) $\sum \dfrac{l_a.l_b}{l_c} \geq p\sqrt{3}$
2) $\sum \dfrac{l_a}{l_a+r_a} \geq \sum cos A$
Bất đẳng thức lượng giác:$\sum \dfrac{l_a.l_b}{l_c} \geq p\sqrt{3}$
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Started By DBSK, 31-12-2011 - 16:56
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