Aider moi vite svp ex. 7 et 8

Ex-7
a.18/16= 18÷2/16÷2= 9/8
b.5/10 = 5÷5/10÷5 = 1/2
c. 30/45= 30÷5/45÷5 = 6/15
d. 12/24= 12÷4/24÷4 =3/6 = 3÷3/6÷3 =1/2
e. 27/36= 27÷9/36÷9= 3/4
f. 70/20 = 70÷5/20÷5 = 14/4 = 14÷2/4÷2 = 7/2