Cho tam giác $ABC$. CMR:
$h_{a}^2\leq \frac{1}{4}(a+b+c)(-a+b+c)$
Chứng minh: $h_{a}^2\leq \frac{1}{4}(a+b+c)(-a+b+c)$
Started By anhswt4857, 28-08-2014 - 21:45
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