Bonjour merci de m'aider :)​

Bonjour

16)

A = 3/7 + 2/7 = 5/7

B= -5/3+ 7/3

B=2/3

C = 4/5,3 - 7/5,3

C= - 3/5,3

D = - 4/8 + - 7/8

D = - 11/8

17)

A = 6/4 - 11/4

A = - 5/4

B = 3/11 - 7/11

B = - 4/11

C = 2/9 - - 5/9

C= 2/9 + 5/9

C= 7/9

D = - 11/7 - - 5/7

D= - 11/7 + 5/7

D= - 6/7.