Bonjour
32)
a) 8/5 x 5/7
= 40/35
= 5 x 8 / 5 x 7
= 8/7
b) - 3/10 x - 11/3
= 33/30
= 3 x 11 / 3 x 10
= 11/10
c) - 2/3 x - 5/2 x 3/- 7
= 10/6 x 3/- 7
= - 30/42
= 6 x - 5 / 6 x 7
= - 5/7
d) 5/- 7 x ( - 7/5)
= 35/35
= 1
e) - 15 x 2/15
= - 30/15
= 15 x - 2 / 15 x 1
= - 2
f) (- 8/3) x (- 1/5) x 3
= 8/15 x 3
= 24/15
= 3 x 8 / 3 x 5
= 8/5