Bonsoir,
A = 3/16 + 1/4
A = 3/16 + (1 x 4) / (4 x 4)
A = 3/16 + 4/16
A = 7/16
B = 6/5 + 7/10
B = (6 x 2) / (5 x 2) + 7/10
B = 12/10 + 7/10
B = 19/10
C = 1/5 + 3/4
C = (1 x 4) / (3 x 4) + (3 x 5) / (4 x 5)
C = 4/12 + 15/12
C = 19/12
D = 18/7 - 2/21
D = (18 x 3) / (7 x 3) - 2/21
D = 54/21 - 2/21
D = 52/21
E = 19/4 - 5/28
E = (19 x 7) / (4 x 7) - 5/28
E = 133/28 - 5/28
E = 128/28
E = (4 x 32) / (4 x 7)
E = 32/7.
F = 1/2 - 1/3
F = (1 x 3) / (2 x 3) - (1 x 2) / (3 x 2)
F = 3/6 - 2/6
F = 1/6.
