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