bonjour aider moi svp 6sur7-9sur8 , 7sur3+5sur7 ,11sur9+3 ,,,,, 2sur3/5sur6 3sur9 /-3, 4sur7/-1sur7,11/22sur5 calculer puis simplifier merci

Bonsoir,

Calculer puis simplifier :

6/7 - 9/8

= (6 x 8) / (7 x 8) - (9 x 7) / (8 x 7)

= 48/56 - 63/56

= - 15/56

7/3 + 5/7

= (7 x 7) / (3 x 7) + (5 x 3) / (7 x 3)

= 49/21 + 15/21

= 64/21

11/9+3

= 11/9 + (3 x 9) / (1 x 9)

= 11/9 + 27/9

= 38/9

2/3 : 5/6

= 2/3 x 6/5

= 12/15

= (3 x 4) / (3 x 5)

= 4/5

3/9 :-3

= 3/9 x - 1/3

= - 3/27

= (3 x - 1) / (3 x 9)

= - 1/9

4/7 : -1/7

= 4/7 x - 7

= - 28/7

= (7 x - 4) / (7 x 1)

= - 4

11 : 22/5

= 11 x 5/22

= 55/22

= (11 x 5) / (11 x 2)

= 5/2.