bonjour
a) 2 x + 4 = 0
2 x = - 4
x = - 4/2 = - 2
b ) 4 x = 16
x = 16/4 = 4
c) 4 x - 2 = 6
4 x = 6 + 2
4 x = 8
x = 8/4 = 2
d) 2 x - 6 = 0
2 x = 6
x = 3
e) 2 x + 7 - 8 + 2 x = x - 2
2 x + 2 x - x = - 2 - 7 + 8
3 x = - 1
x = - 1/3
f) 12 - 3 x - 2 x + 2 = 3 x - 6
- 5 x - 3 x = - 6 - 12 - 2
- 8 x = - 20
x = 20/8 = 10/4
g ) 2 x + 5 > 7
2 x > 7 - 5
2 x > 2
x > 1
h ) x + 4 ≤ 2 x - 1
x - 2 x ≤ - 1 - 4
- x ≤ - 5
x ≥ 5
A = ( x ⁷)² / x ¹⁵
= x ¹⁴ / x ¹⁵
= x ⁻¹
B = x ⁻⁵ * x ³ sur x ⁻¹²
= x ⁻² : x ⁻¹²
= x ¹⁰
C = x * x³ sur x²/x
= x ⁴ : x
= x ³
D = 1 : x ⁻⁷ * x ³
= 1 : x ⁻⁴
= 1/ x ⁻⁴
