Bonjour
A = 4/3 - 8/7 x 1/3
A = 4/3 - 8/21
A = (4 x 7) / (3 x 7) - 8/21
A = 28/21 - 8/21
A = 20/21
B = - 4/5 x 5/6 + 1/7
B = - 20/30 + 1/7
B = (10 x - 2) / (10 x 3) + 1/7
B = - 2/3 + 1/7
B = (- 2 x 7) / (3 x 7) + (1 x 3) / (7 x 3)
B = - 14/21 + 3/21
B = - 11/21
C = 1/4 - 2 x 7/2
C = 1/4 - 14/2
C = 1/4 - (14 x 2) / (2 x 2)
C = 1/4 - 28/4
C = - 27/4
D = 1 - 2/3 x (2/3 - 4/5)
D = 1 - 2/3 x [(2 x 5) / (3 x 5) - (4 x 3) / (5 x 3)]
D = 1 - 2/3 x (10/15 - 12/15)
D = 1 - 2/3 x (- 2/15)
D = 1 + 4/45
D = (1 x 45) / (1 x 45) + 4/45
D = 45/45 + 4/45
d + 49/45
E = 4/7 - 1/3 : (- 5/2 + 4/6)
E = 4/7 - 1/3 : [(- 5 x 3) / (2 x 3) + 4/6]
E = 4/7 - 1/3 : (- 15/6 + 4/6)
E = 4/7 - 1/3 : (- 11/6)
E = 4/7 - 1/3 x - 6/11
E = 4/7 + 6/33
E = 4/7 + (3 x 2) / (3 x 11)
E = 4/7 + 2/11
E = (4 x 11) / (7 x 11) + (2 x 7) /(11 x 7)
E = 11/77 + 14/77
E = 25/77
F = (2/5 - 3/4) : (1/2 - 4/3)
F = [(2 x 4) / (5 x 4) - (3 x 5) /(4 x 5)] : [(1 x 3) / (2 x 3) - (4 x 2) / (3 x 2)]
F = (8/20 - 15/20) : (3/6 - 8/6)
F = - 7/20 : - 5/6
F = - 7/20 x - 6/5
F = 42/100
F = (2 x 21) / (2 x 50)
F = 21/50.
