Bonsoir,
A = 7/10 - 7/8
A = (7 x 4) / (10 x 4) - (7 x 5) / (8 x 5)
A = 28/40 - 35/40
A = - 7/40
B = 7/8 + 5
B = 7/8 + (5 x 8) / (1 x 8)
B = 7/8 + 40/8
B = 47/8
C = 8,3 - 3/7
C = (8,3 x 7) / (1 x 7) - 3/7
C = 58,1/7 - 3/7
C = 55,1/7
D = 6/10 + 7/2
D = 6/10 + (7 x 5) / (2 x 5)
D = 6/10 + 35/10
D = 41/10
E = 10/7 - 4/9
E = (10 x 9) / (7 x 9) - (4 x 7) / (9 x 7)
E = 90/63 - 28/63
E = 62/63
F = 2/8 + 4/3
F = (2 x 3) / (8 x 3) + (4 x 8) / (3 x 8)
F = 6/24 + 32/24
F = 38/24
F = (2 x 19) / (2 x 12)
F = 19/12.
G = 1 - 2/3
G = (1 x 3) / (1 x 3) - 2/3
G = 3/3 - 2/3
G = 1/3
H = 8/9 - 1/9
H = 7/9.
