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It is known that: AB / (a + b) = 1, BC / (B + C) = 2, AC / (a + C) = 3
AB / (a + b) = 1, BC / (B + C) = 2, AC / (a + C) = 3, turn them all into reciprocal, and get (a + b) / AB = 1, Yi (B + C) / BC = 1 / 2, ER (a + C) / AC = 1 / 3, Sanyi can be changed into 1 / A + 1 / b = 1er can be changed into 1 / B + 1 / C = 1 / 2san can be changed into 1 / A + 1 / C = 1 / 3yi - San = 1 / B - 1 / C = 2 / 3 {1 / B - 1 / C = 2 / 3}
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