Bonjour
A= 7/2+5/3
A = (7 x 3) / (2 x 3) + (5 x 2) / (3 x 2)
A = 21/6 + 10/6
A = 31/6
B=7/18+5/12
B = (7 x 2) / (18 x 2) + (5 x 3) / (12 x 3)
B = 14/36 + 15/36
B = 29/36
C=25/-16 X-24/35
C = 600/560
C = (40 x 15) / (40 x 14)
C = 15/14
D=2/3:5/7
D = 2/3 x 7/5
D = 14/15
E= 3/7 - 2/7 X5/3
E = 3/7 - 10/21
E = (3 x 3) (7 x 3) - 10/21
E = 9/21 - 10/21
E = - 1/21.
