bonsoir
a. (x-1)(4-3x)=3x(3-X)
4 x - 3 x² - 4 + 3 x = 9 x - 3 x²
- 3 x² + 3 x² + 4 x + 3 x - 9 x = 4
- 2 x = 4
x = - 2
b. (2x-3)(x-4)-(2x-3)(5x-1)=0
( 2 x - 3 ) ( x - 4 - 5 x + 1 ) = 0
( 2 x - 3 ) ( - 4 x - 3 ) = 0
x = 3/2 ou - 3/4
d. (x-4)au carré =25
( x - 4 )² - 25 = 0
( x - 4 - 5 ) ( x - 4 + 5)= 0
( x - 9 ) ( x + 1 ) = 0
x = 9 ou - 1
3- 2x+8/4 = x-4/6
36 /12 - 24 x /12 + 24 /12 = 12 x / 12 - 8 /12
- 24 x - 12 x = - 8 - 36 - 24
- 36 x = - 68
x = 68/36 = 17/9
