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(a^2+1)/a= 58/21 ; 21(a^2+1) = 58 a ; 21a^2 +21 -58a=0
21a^2-58a+21=0 ; aplicando la formula para encontrar las raices tenemos
a= -(-58)+- Raiz^2[ (-58)^2-4(21)(21)] / 2*21
a= 58 +- 40/42 ; a1= 3/7 y a2= 7/3
entonces los numeros racionales son 3/7 y 7/3