bonjour
3 x + 5 pour x = 2.3
= 3 * 2.3 + 5 = 11.9
2 ) 15 - 4 *5 + 2 x
= 2 x + 15 - 20
= 2 x - 5
5 ( a + 7) = 5 * a + 5 * 7 = 5 a + 35
2 ( a - 4 ) = 2 a - 8
- 3 ( 7 + 5) = - 21 - 15 = - 36
4 ) 3 x + 33 = 3 ( x + 11 )
5 x - 60 = 5 ( x - 12)
5 y + 25 = 5 ( y + 5 )
6 y - 42 = 6 ( y - 7 )
5 ) ( 9 x + 6 ) / 3 = 3 x + 2
longueur = 3 x + 2