Let a, B and C be positive real numbers, and prove that 12a + 12b + 12C ≥ 1b + C + 1C + A + 1A + B

Let a, B and C be positive real numbers, and prove that 12a + 12b + 12C ≥ 1b + C + 1C + A + 1A + B

It is proved that: ∵ a, B, C are all positive real numbers. ∵ 12 (12a + 12b) ≥ 12ab ≥ 1A + B, when a = B, the equal sign holds; 12 (12b + 12C) ≥ 12bc ≥ 1b + C, when B = C, the equal sign holds; 12 (12C + 12a) ≥ 12ca ≥ 1C + A, when a = C, the equal sign holds; by adding three inequalities, we get 12a + 12b + 12C ≥ 1b + C + 1C +