Cho tam giác ABC nhọn có H là trực tâm. Chứng minh rằng $\frac{HA}{BC}+\frac{HB}{CA}+\frac{HC}{AB}\geq \sqrt{3}$
Chứng minh rằng $\frac{HA}{BC}+\frac{HB}{CA}+\frac{HC}{AB}\geq \sqrt{3}$
Started By Ngoc Hung, 28-04-2015 - 15:52
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