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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: Cho $\text{a, b, c > 0.}$ CMR: $\dfrac{1}{a}$ + $\dfrac{1}{b}$ + $\dfrac{1}{c}$ $\ge$ $\dfrac{3}{a+2b}$ + $\dfrac{3}{b+2c}$ + $\dfrac{3

Toán Lớp 8: Cho $\text{a, b, c > 0.}$ CMR: $\dfrac{1}{a}$ + $\dfrac{1}{b}$ + $\dfrac{1}{c}$ $\ge$ $\dfrac{3}{a+2b}$ + $\dfrac{3}{b+2c}$ + $\dfrac{3}{c+2a}$