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  • Utilisateur Brainly
2014-10-12T08:51:20+02:00
Ex 5 : 

a) 3x
b) xy
c) 12
d) 7b
e) 7ab
f) 3a+ 24

Ex 7 :

a) 8 x 3 = 3 = 24 + 3 = 27
b) 24 - 7 x 3 = 24 - 21 = 3
c) 5 x (3 + 8) = 5 x 11 = 55
d) 3 x (14 - 2 x 3) = 3 x (14 - 6) = 3 x 8 = 24
e) 3² = 3 x 3 = 9
f) 3³ = 3 x 3 x 3 = 9 x 3 = 27
2014-10-12T10:10:11+02:00
Exercice 5

a) 3 * x = 3x
b) x * y = xy
c) 3 * 4 = 12
d) b * 7 = 7b
e) 7 * a * b = 7ab
f) 3 * a + 4 * 6 = 3a + 24

Exercice 7 : Calculer chaque expression pour x = 3

a) 8x + 3 = 8 * 3 + 3 = 24 + 3 = 27
b) 24 - 7x = 24 - 7 * 3 = 24 - 21 = 3
c) 5 (x + 8) =  5 * (3 + 8) = 5 x 11 = 55
d) x (14 - 2x) = 3 * (14 - 2 * 3) = 3 * (14 - 6) = 3 * 8 = 24
e) x² = 3² = 9
f) x³ = 3³ = 27