Bonsoir,
Exercice 2
a)
2(2x+5+x) = 4x+10 + 2x = > 6x +10
b)
6x+10 = 31
6x = 31 -10
6x = 21
x= 21/6
x= 3,5
l= 3,5 m
L = 12m
Mariam: x
Charles : 4x
Lila :4x-150
x+ 4x+ 4x-150 = 3 000
9x = 3 000 +150
9x = 3 150
x= 3 150 / 9
x= 350
Mariam: 350
Charles : 4*350=1 400
Lila : 1400 -150 = 1250
