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choe cra ela b , |
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Answer» (a-b)/c +(b-c)/a +(c+a)/b=1 (a-b)/c +(b-c)/a +(c+a)/b=1+1-1 (a-b)/c+1 +(b-c)/a-1 +(c+a)/b-1=0 {(a-b)/c+1} +{(b-c)/a-1} +{(c+a)/b-1}=0 (a-b+c)/c +(b-c-a)/a +(c+a-b)/b=0 (a-b+c)/c -(-b+c+a)/a +(c+a-b)/b=0 (a-b+c)/c -(a-b+c)/a +(a-b+c)/b=0 (a-b+c)(1/c-1/a+1/b)=0 so {1/c-1/a+1/b}=0 =>1/a=1/b+1/c |
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