Рациональное уравнение:

4x+1/x=5

x^2/x+3=9/x+3

4x + 1/x= 5 |*x4x^2 +1= 5x4x^2 -5x +1= 0 D= 25 - 4*4*1= 9√9 = 3x1= (5+3)/8=1 ;x2= (5-3)/8= -0,25.x^2/x +3= 9/x+3 |*xx^2 +3x =9+3xx^2= 9x1= 3;x2= -3.