срочно!!!
довести:
ab(a+b-2c) + bc(b+c-2a) + ac(a+c-2b) ≥ 0
якщо a>0, b>0, c>0
довести:
ab(a+b-2c) + bc(b+c-2a) + ac(a+c-2b) ≥ 0
якщо a>0, b>0, c>0
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