Bonsoir
a. - 16/7 x - 1/4 = 16/28 = (4 x 4) / (4 x 7) = 4/7
b. 5/- 6 x 2/3 = - 10/18 = (2 x (- 5) / (2 x 9) = - 5/9
c. 9/2 x 7/- 18 = - 63/36 = (9 x - 7) / (9 x 4) = - 7/4
d. 5/4 x - 2/- 15 = 10/60 = (10 x 1) / (10 x 6) = 1/6
e. - 2/3 x 3/10 = - 6/30 = (6 x - 1) / (6 x 5) = - 1/5
f. 8/5 x (- 7/24) = - 56/120 = (8 x - 7) / (8 x 15) = - 7/15
