Réponse
* = x (c pour pas confondre avec la lettre)
Exercice 4:
A= x4 + 6
B= 2 - y5
C= 4 * x²
D= 4 + x2
E= 6 + y4
F= x6 - x * y
G= (y1) * 3
H= 7x * 8x * 2 (?)
Exercice 7:
a) x - 5
b) n6 + 2
c) (c + 8) * 7
d) (y - 1) * 3
Exercice 19:
a) 10 - 3 = 7
b) 10 * 3 - 5 = 30 - 5 = 25
c) 4 * 10 - 9 * 3 = 40 - 27 = 13
d) (2 * 10) * 3 = 20 * 3 = 60
e) (2 * 10) * (2 * 3) = 20 * 6 = 120
f) 10² - 3² = 10 * 10 - 3 * 3 = 100 - 9 = 91
g) (10 - 3)² = 7² = 7 * 7 = 49
h) 2 * ( 10 - 3) = 2 * 7 = 14
i) 10 * (3 + 1) = 10 * 4 = 40
Exercice 28:
a) 4 * (x + 5) = 4x + 5
b) 3 * (y + 18) = 3y + 18
c) 5 * (z + 5) = 5z + 5
d) 2 * (u - 16) = 2u - 16
e) 8(2v - 8) = 2v8 - 8
f) w(w - 5) = w² - 5
Exercice 40:
A= 93 * 15 + 7 * 15 = (93 * 15) + (7 * 15) = 1395 + 105 = 1500
B= 7 * 85 + 3 * 85 = (7 * 85) + (3 * 85) = 595 + 255 = 850
C= 18 * 102 - 18 * 2 = (18 * 102) - (18 * 2) = 1836 - 36 = 1800
D= 76 * 13 - 76 * 3 = (76 * 13) - (76 * 3) = 988 - 228 =760
