Réponse :

Explications étape par étape

Bonjour,

a)

2x+6 = 4x-4

6+4 = 4x -2x

10 = 2x

x= 10/2 = 5

b)

5-5x = 6x +3

5-3 = 6x +5x

2 = 11x

x= 2/11

c)

-x+2 = 4x +2

2-2 = 4x-x

S = 3x

x= 0

d)

3x+1 = 6 -3x

3x+3x = 6-1

6x = 5

x= 5/6

A)2(x+3)=4(x-1)

(2×x)+(2×3)=(4×x)-(4×1)

2x+6=4x-4

2x-4x=-4-6

-2x=-10

-2x/-2=-10/-2

X=5

B)5(1-x)=3(2x+1)

(5×1)-(5×x)=(3×2x)+(3×1)

5-5x=6x+3

-5x-6x=3-5

-11x=-2

-11x/-11=-2/-11

X=2/11

C)-(x-2)=2(2x+1)

-x+2=(2×2x)+(2×1)

-x+2=4x+2

-x-4x=2-2

-5x=2-2

X=5x=0

D)3x+1=3(2-x)

3x+1=(3×2)-(3×x)

3x+1=6-3x

3x+3x=6-1

6x=5

6x/6=5/6

X=5/6