Cho a,b,c dương. C/m $\sum(\frac{(a+2b)^3}{(a+2c)^3})\geqslant 3$
$\sum(\frac{(a+2b)^3}{(a+2c)^3})\geqslant 3$
Started By alexander123, 15-12-2021 - 19:55
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