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Bonjour je dois faire des équations
7x - 15 = 4x - 6
5 (x + 3) - 2 = 5 + (3x - 1)
4/5x + 11 = -5

Sagot :

LOUANNBOURLET59
7x -15+ 15= 4x - 6 +15
7x + 4x= 4x +9 -4x
11x=9
x=9/11
MAYNOW

7x-15 = 4x-6

7x-4x = -6+15

3x = 9

x = 9/3

x = 3

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

5x+15-2 = 5+3x-1

5x-3x =5- 15+2-1

2x = -9

x = -9/2

x = -4,5

4/5x + 11 = -5

4/5x = -5-11

4/5x = -16

4 = -80x      (on multiplie les deux cotés de l'équation par 5x)

-80x = 4

x = -1/20

x = 0,05