Sagot :
Bonjour,
1) (a - b)² = a² - 2ab + b²
a = (a - 8)²
a = a * a - a * 8 * 2 - 8 * - 8
a = a² - 16a + 64
b = (1 - 4y)²
b = 1 * 1 - 4y * 1 * 2 - 4y * - 4y
b = 1 - 8y + 16y²
c = (7 - 2t)²
c = 7 * 7 - 7 * - 2t * 2 - 2t * - 2t
c = 49 - 28t + 4t²
2) (a + b) (a - b) = a²- b²
D = (d + 8) (d - 8)
D = d * d + 8 * - 8
D = d² - 64
E = (3a - 1) (3a + 1)
E = 3a * 3a - 1 * 1
E = 9a² - 1
F = (5 + 7b) (5 - 7b)
F = 5 * 5 + 7b * - 7b
F = 25 - 49b²
3) (a + b)² = a² + 2ab + b²
G = (9 + y)²
G = 9 * 9 + 9 * y * 2 + y * y
G = 81 + 18y + y²
H = (6t + 1)²
H = 6t * 6t + 6t * 1 * 2 + 1 * 1
H = 36t² + 12t + 1
J = (5a + 3)²
J = 5a * 5a + 5a * 3 * 2 + 3 * 3
J = 25a² + 30a + 9.
Réponse :
Bonjour
Explications étape par étape
Partie 2
A = (a -8)² = a² +64 -16a
B = (1 -4y)² = 1 -8y +16y²
C = (7 -2t)² = 49 -28t +4t²
Exercice 2
D = (d +8) (d-8) = d² -64
E = (3a -1)(3a +1) = 9a² -1
F = (5 +7b)(5 -7b) = 25 -49b²
Exercice 3
G = ( 9+y)² = 81 +18y +y²
H = (6t +1)² = 36t² +12t +1
J = (5a +3)² = 25a² +30a +9