Ответ:

xє/R  

хє/R

x1= 3-√15/2

x2= 3+√15/2

Объяснение:

7/x = - 4x +1

7/x = -4x +1

7 = (- 4x+1)x

7-(-4x +1)x = 0

7 + 4x2 - x =0

4x2- x +7 = 0

a = 4, b = - 1, c = 7

x=1+-√(-1)2 -4 * 4 * 7

x є/ R

2x - 4/x2 +3 = 3х2/x2 + 3

2x - 4/х2+3 = 3х2/ х2+3, X є R

2х-4 = 3х2

2x- 4 = 3x2

2x - 4 - 3x2 = 0

-3x+ 2x - 4 = 0

3x2- 2x + 4 = 0

a = 3, b = - 2,c = 4

х= 2+-√4-48 / 6

хє/R

X - 2/ 3x +1= X - 3/ x,  X ≠-1/3, X≠0

(x-2)x - (x-3) * (3x+1)=0

x2-2x-(3x2-8x-3)=0

2x2-6x-3=0

a=2, b=-6, c=-3

x=3+√15 / 2; x=3-√15 / 2

x1= 3-√15/2

x2= 3+√15/2