Question

номер 8.50, 2.
ответ должен получиться 105.

Answer 1

$x^{2} -12x+13=0 \ left { {{x_{1} * x_{2} =13} atop x_{1} + x_{2} =12}} right. \ frac{1}{12} *( x^{3} _{1}+ x^{3} _{2})= frac{1}{12} *((x _{1}+ x _{2})^{3}-3*x _{1}* x _{2}*(x _{1}+ x _{2}))= \ =frac{1}{12} *(12^{3}-3*13*12)=105$