Verified answer

Réponse:

(5x-2)(4-x)/x+10 = 0

(5x-2)(4-x) =0

20x-5x^2-8+2x =0

-5x^2+22x = 8

x(-5x+22) = 8

donc

x= 8

ou -5x+22=8

x=8

ou

x= 14/5

x={14/5,8}

b)

x^2-10/3-x = 0

x^2-10 = 0

x^2 = 10

x =- ✓10 ou x= ✓10

c)

x+1/(10-2x)(2x+2) = 0

x+1 =0

x = -1

d)

2x/x-10 = 2

2x = 2(x-10)

2x= 2x-20

2x-2x =-20

0 =-20

impossible