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