x2/x1 + x1/x2 = (x2^2 + x1^2)/x1x2 = ((x1+x2)^2-2x1x2)/x1x25x^2-50x-60=0По теореме Виета: x1+x2=50/5=10; x1x2=-60/5=-12(10^2-2*(-12))/-12=(100+24)/-12=124/-12=62/-6=-31/3
x2/x1 + x1/x2 = (x2^2 + x1^2)/x1x2 = ((x1+x2)^2-2x1x2)/x1x2
5x^2-50x-60=0
По теореме Виета: x1+x2=50/5=10; x1x2=-60/5=-12
(10^2-2*(-12))/-12=(100+24)/-12=124/-12=62/-6=-31/3