Aider moi c'est pour demain 3/9+5/2 6/7-2/3 7/4-9/5 3/8+1/7 -7/3+-1/4 2/11-3/10

Bonsoir,

3/9+5/2  

= (3 x 2) / (9 x 2) + (5 x 9) / (2 x 9)

= 6/18 + 45/18

= 51/18

= (3 x 17) / (3 x 6)

= 17/6

6/7-2/3

= (6 x 3) / (7 x 3) - (2 x 7) / (3 x 7)

= 18/21 - 14/21

= 4/21

7/4-9/5

= (7 x 5) / (4 x 5) - (9 x 4) / (5 x 4)

= 35/20 - 36/20

= - 1/20

3/8+1/7

= (3 x 7) / (8 x 7) + (1 x 8) / (7 x 8)

= 21/56 + 8/56

= 29/56

-7/3+-1/4

= (- 7 x 4) / (3 x 4) - (1 x 3) / (4 x 3)

= - 28/12 - 3/12

= - 31/12

2/11-3/10

= (2 x 10) / (11 x 10) - (3 x 11) / (10 x 11)

= 20/110 - 33/110

= - 13/110.