Qui peut m'aider a calculer 7/9 - 1/9 x 3/2 et 5/2 * (7/4 + 9/2)

7/9-1/9 * 3/2=6/9*3/2

                     =6*3/9*2

                    =0

5/2*(7/9+9/2)

=5/2(7*2/4*2+9*4/2*4)

=5/2(14/8+36/8)

=5/2*50/8

=5*5*2*5/2*8

=15/8