[toán 10]-câu hỏi cần được giải đáp

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vy000

$\dfrac{ab}c+\dfrac{ca}b \ge 2a$
$\dfrac{2ab}c+\dfrac{2bc}a \ge 4b$
$\dfrac{3ca}b+\dfrac{3bc}a \ge 6c$
 
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