Urgent c pour demain et c note svp

4/9 + 2/3 - 2
= 4/9 + 2 x 3 / 3 x 3 - 2 x 9 / 1 x 9
= 4/9 + 6/9 - 18/9
= 10/9 - 18/9
= - 8/9

A = 10/9 - 5/9 x 5/3
A = 10/9 - 25/27
A = 10 x 3 / 9 x 3 - 25/27
A = 30/27 - 25/27
A = 5/27

- 33/25 x 35/11
= - 1155/275
= 55 x (- 21) / 55 x 5
= - 21/5

B = (3/8 - 5/6) x 2/11
B = (3 x 3 / 8 x 3 - 5 x 4 / 6 x 4) x 2/11
B = (9/24 - 20/24) x 2/11
B = - 11/24 x 2/11
B = - 22/264
B = 22 x (- 1) / 22 x 12
B = - 1/12