bonjour
tu vois bien que cela ne ressemble en rien à ton premier post
a ) 4 x + 16 = 28
4 x = 28 - 16
4 x = 12
x = 3
b ) 3 x - 13 = 41
3 x = 41 + 13
3 x = 54
x = 18
c ) - 8 x + 14 = 27
- 8 x = 27 - 14
- 8 x = 13
x = - 13/8
d ) - 10 x - 100 = - 28
- 10 x = - 28 + 100
- 10 x = 72
x = - 7.2
e ) 7 x + 14 = 100 x - 12
7 x - 100 x = - 12 - 14
- 93 x = - 26
x = 26/93
f ) 3 x + 3 + 32 x - 48 = 100
35 x = 100 - 3 + 48
35 x = 145
x = 145/35 = 29/ 7
g ) 24 x - 3 + 16 x - 2 = 23
8 x = 23 + 3 + 2
8 x = 28
x = 28/8 = 14/4
h ) ( 3 x + 6 ) ( 7 x - 2 ) = 0
soit 3 x + 6 = 0 et x = - 6/3 = - 2
soit 7 x - 2 = 0 et x = 2/7
i) ( 5 x + 6 ) ( 9 x - 2 ) = - 12
45 x² - 10 x + 54 x - 12 = - 12
45 x² - 44 x - 12 + 12 = 0
45 x² - 44 x = 0
x ( 45 x - 44 ) = 0
x = 0
ou bien 45 x = 44 et x = - 44/45
fais le dernier
