T
tieuquy_dn2002


Cho a,b,c là những số thực:thỏa $\dfrac{1}{a} + \dfrac{1}{b}+ \dfrac{1}{c}=4$
Cmr:
$\dfrac{1}{a+b+2c} + \dfrac{1}{a+2b+c} + \dfrac{1}{2a+b+c} \leq \dfrac{3}{4}$
Cmr:
$\dfrac{1}{a+b+2c} + \dfrac{1}{a+2b+c} + \dfrac{1}{2a+b+c} \leq \dfrac{3}{4}$
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