Bonjour
D= 3+2/5-8/15
D = (3 x 15) / (1 x 15) + (2 x 3) / (5 x 3) - 8/15
D = 45/15 + 6/15 - 8/15
D = 51/15 - 8/15
D = 43/15
E= 34/40×27/51
E = 918/2040
E = (102 x 9) / (102 x 20)
E = 9/20
F= 3/4-5/4×2/3
F = 3/4 - 10/12
F = (3 x 3) / (4 x 3) - 10/12
F = 9/12 - 10/12
F = - 1/12
G= 8/21 : 4/7
G = 8/21 x 7/4
G = 56/84
G = (28 x 2) / (28 x 3)
G = 2/3.
