bonjour
8 x + 9 = 33
8 x = 33 - 9
8 x = 24
x = 3
8 t - 10 = 5t - 2
8 t - 5 t = - 2 + 10
3 t = 8
t = 8/3
0 x = 5 donc pas de solution
21 x- 15 = 4 x - 32
21 x - 4 x = - 32 + 15
17 x = - 17
x = - 1
( 6 x + 5 ) ( 3 - 4 x ) = - 8 x ( 3 x - 7)
18 x - 24 x² + 15 - 20 x = - 24 x² + 56 x
- 24 x² + 24 x² + 18 x - 20 x - 56 x = - 15
- 58 x = - 15
x = 15/58
( 2 x - 7 ) / 5 = ( 5 - 8 x ) /3
6 x - 21 = 25 - 40 x
6 x + 40 x = 25 + 21
46 x = 46
x = 1
7 x /4 - 2 x /3 = 2 - 5 x / 6
21 x /12 - 8 x /12 = 24 /12 - 10 x /12
21 x - 8 x + 10 x = 24
23 x = 24
x = 24/23
x² = 81
x = √81 ou - √81
x = 9 ou ( - 9)
x² = - 64 ⇒ pas de solution dans R
( 2 x + 5 )² = 144
( 2 x + 5 )² - 144 = 0
( 2 x + 5 - 12 ) ( 2 x + 5 + 12 ) = 0
( 2 x - 7 ) ( 2 x + 17) = 0
x = 7/2 ou - 17/2
x² = 72
x = √72 ou - √72
x² = 48
x = √48 ou - √48
