Tam giác ABC nhọn. Điểm M bất kì nằm trong tam giác.
Chứng minh rằng: MA $\sin BMC$ + MB $\sin CMA$ + MC $\sin AMB$ $\geq$ $\frac{AB+BC+CA}{2}$
CMR: MA $\sin BMC$ + MB $\sin CMA$ + MC $\sin AMB$ $\geq$ $\frac{AB+BC+CA}{2}$
Started By CandyPanda, 27-11-2014 - 20:03
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