Bonjour,
59)
A = - 11/3 x (- 2/7) x 3/2
A = 22/21 x 3/2
A = 66/42
A = 6 x 11 / 6 x 7
A = 11/7
B = 8/5 x - 5/3 x (- 9/16)
B = - 40/15 x (- 9/16)
B = 360/240
B = 120 x 3 / 120 x 2
B = 3/2
C = - 5/4 x - 8/15 x (- 3/4) x 4
C = 40/60 x - 12/4
C = - 480/240
C = 240 x - 2 / 240 x 1
C = - 2
D = 34/15 x (- 60/17) x 3/4
D = - 2040/255 x 3/4
D = - 6120/1020
D = 1020 x - 6 / 1020 x 1
D = - 6
69)
a. 6/7 = 6 x 1/7
b - 5/9 = - 5 x 1/9
c. - 3/11 = - 3 x 1/11
d. - 3/8 = - 3 x 1/8