Réponse :
Les deux exercices sont les mêmes je te fais entièrement le premier à toi de faire le second
Explications étape par étape
Bonjour
Exercice 1 :
A = 3/2 x 5/8
A = (3 x 5)/(2 x 8)
A = 15/16
B = 7/4 : 3/7
B = 7/4 x 7/3
B = (7 x 7)/(4 x 3)
B = 49/12
C = -1/3 x -1/-4
C = -1/3 x 1/4
C = -1/(3 x 4)
C = -1/12
D = -7/2 : -2/-9
D = -7/2 x 9/2
D = -(7 x 9)/(2 x 2)
D = -63/4
E = 18/25 x 35/18
E = 18/18 x 35/25
E = 1 x (7 x 5)/(5 x 5)
E = 7/5
F = 32/35 : 16/35
F = 32/35 x 35/16
F = 32/16 x 35/35
F = (16 x 2)/16
F = 2
G = -21/40 : -42/-12
G = -21/40 x 12/42
G = -21/42 x 12/40
G = -21/(2 x 21) x (3 x 4)/(10 x 4)
G = -1/2 x 3/10
G = -3/20
H = -35/27 x 45/-21
H = 35/21 x 45/27
H = (7 x 5)/(7 x 3) x (9 x 5)/(9 x 3)
H = 5/3 x 5/3
H = (5 x 5)/(3 x 3)
H = 25/9
