Sagot :
Bonjour,
A) 7x - 21 = 0
7x = 21
x = 21/7
x = 3
B) 12x - 5 = 7
12x = 7 + 5
12x = 12
x = 12/12
x = 1
C) 2 - 1,2x = 0,2
- 1,2x = 0,2 - 2
- 1,2x = - 1,8
x = 1,8/1,2
x = 1,5.
Bonjour,
A) 7x - 21 = 0
7x = 21
x = 21/7
x = 3
B) 12x - 5 = 7
12x = 7 + 5
12x = 12
x = 12/12
x = 1
C) 2 - 1,2x = 0,2
- 1,2x = 0,2 - 2
- 1,2x = - 1,8
x = 1,8/1,2
x = 1,5.