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If a , b , a,b, a,b,and c c care the side lengths of △ A B C \triangle ABC △ABCopposite to angles A , B , A,B, A,B,and C , C, C,respectively, and r 1 , r 2 , r_{1},r_{2}, r1,r2,and r 3 r_{3} r3相应的exradii,那么找到价值吗of
b − c r 1 + c − a r 2 + a − b r 3 . \frac {b-c}{r_{1}} + \frac {c-a}{r_{2}} + \frac{a-b}{r_{3}}. r1b−c+r2c−a+r3a−b.
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