bonjour
( 4 - 2 x ) ( 3 + 15 x ) = 0
x = 2 ou - 3/15 = - 1 /5
( x +3 )² = 25
( x + 3 )² - 25 = 0
( x + 3 - 5 ) ( x + 3 + 5 ) = 0
( x - 2 ) ( x + 8 ) = 0
x = 2 ou - 8
3 √x = 21
x = 49
( 5 x - 20 ) / ( x + 3 ) = 0 avec x ≠ - 3
x = 4
( x + 1 ) / ( x - 1 ) = 1 /2
x - 1 = 2 x + 2
x - 2 x = 2 + 1
- x = 3
x = - 3
