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A = - 5/7 : 3/4

A = - 5/7 x 4/3

A = - 20/21

B = 25/- 8 : (- 15/- 4)

B = - 25/8 x 4/15

B = - 100/120

B = (20 x - 5) / (20 x 6)

B = - 5/6

C = - 15/7 : 5/-4

C = - 15/7 x - 4/5

C = 60/35

C = (5 x 12) / (5 x 7)

C = 12/7

D = 5/- 3 : - 7/2

D = - 5/3 x - 2/7

D = 10/21

E = - 70/12 : 14/- 6

E = - 70/12 x - 6/14

E = 420/168

E = (84 x 5) / (84 x 2)

E = 5/2

F = - 1,2/15 : 1,8/40

F = - 1,2/15 x 40/1,8

F = - 48/27

F = (3 x - 16) / (3 x 29)

F = - 16/29.