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It is known that a + B + C = 2,0
It is known that a + B + C = 2,0
Let me miss the days of primary school. Prove: just prove: 2 (AB + AC + BC) > 2; 2 (AB + AC + BC) > A + B + C; have: 2 (AB + AC + BC) = a (B + C) + B (a + C) + C (a + b)
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