Bonsoir
a) 15 / 25
= (3 x 5) / (5 x 5)
= 3 / 5
b) 32 / 24
= (8 x 4) / (6 x 4)
= 8 / 6
= (4 x 2) / (3 x 2)
= 4 / 3
c) 111 / 74
= (3 x 37) / (2 x 37)
= 3 / 2
d) 4 / 22
= (2 x 2) / (11 x 2)
= 2 / 11
e) 18 / 27
= (6 x 3) / (9 x 3)
= 6 / 9
= (2 x 3) / (3 x 3)
= 2 / 3
f) 42 / 35
= (6 x 7) / (5 x 7)
= 6 / 5
g) 14 / 24
= (7 x 2) / (12 x 2)
= 7 / 12
h) 50 / 45
= (10 x 5) / (9 x 5)
= 10 / 9
Voilà j'espère avoir pu t'aider ^^