Bonjour pouvez vous m’aider

Bonjour,

A)

3/10 +20/60

= 18/60 + 20/60

= 38/60 = 19/30

B)

9/14 *4/3

= 36/42 = 18/21= 6/7

C)

(45/12 +5/12 )/(10/9)

= (50/12 )/(10/9)

= (25/6) * 9/10

= 225/60 = 45/12 = 15/4

D)

(55/6 - 15/6) * 1/20

= 40/6 *1/20

= 20/3 *1/20

= 20/60 =2/6 =1/3