If \( a, b, c \) are positive real numbers, then prove that
\( \mat... VIDEO
If \( a, b, c \) are positive real numbers, then prove that
\( \mathrm{P} \)
\[
\frac{2}{a+b}+\frac{2}{b+c}+\frac{2}{c+a} \geq \frac{9}{a+b+c}
\]
W.
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