Salut,
E:
4/15 : 2/3
= (4x2) / (15x3)
= 8/45
F:
-54/35 : 27/14
= -54/35 x 14/27
= (-54 x 14) / (35 x 27)
= -756 / 945
= -4/5
G:
-24/11 : -6/1
= 24/11 x 1/6
= 24/(11x6)
= 24/66
= 4/11
H:
= (2/9) : (7/24)
= 2/9 x 24/7
= (2x24) / (9x7)
= 48/63
= 16/21
I:
(7/8) : (-1/4)
= 7/8 x 4/-1
= (7x4) / (8x(-1))
= 28 / -8
=-7/2
J:
(10/1) : (3/2)
10/1 x 2/3
(10x2) / (1x3)
20/3
Voilà !
