Cho a,b,c là 3 cạnh tam giác có chu vi là 4.CMR. $\frac{1}{a}+\frac{1}{b}+\frac{1}{c}+8> 9(\frac{1}{a+b}+\frac{1}{b+c}+\frac{1}{a+c})$
Cho a,b,c là 3 cạnh tam giác
Started By blink04, 13-05-2019 - 16:10
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Posted 13-05-2019 - 16:10
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