докажите неравенство
[tex]a+b+c \geq \sqrt{ab} + \sqrt{bc} + \sqrt{ac} (a\ \textgreater \ 0, b\ \textgreater \ 0, c\ \textgreater \ 0)[/tex]
[tex]a+b+c \geq \sqrt{ab} + \sqrt{bc} + \sqrt{ac} (a\ \textgreater \ 0, b\ \textgreater \ 0, c\ \textgreater \ 0)[/tex]
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