Sagot :
1
a) 3(x+5)=3x+15
b) 7(6-y)=42-7y
c) 7(a+4)=7a+28
d) m(m-3)=m^2-3m
2
a3
b4
c2
d1
3
a) 8x(6+x)=48+8x
b) 7x(5-a)=35-7a
c) x x (12-y)=12x-yx
d) (15+b)x a=15a+ab
bon courage.
Exercice 1 :
a) 3x+15
b) -7y + 42
c) 7a + 28
d) m² - 3m
Exercice 2 :
a -> 3
b -> 4
c -> 2
d -> 1
Exercice 3 :
a) 48 + 8x
b) 35 - 7a
c) 12x - xy
d) 15a + ab