Est ce quelqu’un peux m’aider à simplifier svp ?

Bonjour

a. 18/16 = (2 x 9) / (2 x 8) = 9/8

b. 5/10 = (5 x 1) / (5 x 2) = 1/2

c. 30/45 = (15 x 2) / (15 x 3) = 2/3

d. 12/24 = (12 x 1) / (12 x 2) = 1/2

e. 27/36 = (9 x 3) / (9 x 4) = 3/4

f. 70/20 = (10 x 7) / (10 x 2) = 7/2.