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$$\dfrac{ab}{a+c}+\dfrac{ab}{b+c} \ge \dfrac{4ab}{a+2c+b} $$

$$\dfrac{bc}{a+b}+\dfrac{bc}{c+a} \ge \dfrac{4bc}{2a+b+c} $$

$$\dfrac{ca}{a+b}+\dfrac{ca}{b+c} \ge \dfrac{4aca}{a+2b+c} $$

Cọng vế theo vế thành công đấy bạn
 
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