Bonsoir pouvez vous m'aidez à l'exercice 44 merci davance

Bonsoir,

A = 7/5 x 3/4
A = 21/20

B = 4/3 x 7/4
B = 28/12
B = 4 x 7 / 4 x 3
B = 7/3

C = 1/5 x 8/7
C = 8/35

D = 5 x 7/2
D = 35/2

E = 3/8 x 32
E = 96/8
E = 8 x 12 / 8 x 1
E = 12

F = 0,7/6 x 1/4
F = 0,7/24
F = 0,7 x 10 / 24 x 10
F = 7/240

G = 1,7/0,5 x 1,3/2,5
G = 2,21/1,25
G = 2,21 x 100 / 1,25 x 100
G = 221/125

H = 1,4/3 x 0,9/28
H = 1,287/84
H = 1,287 x 1000 / 84 x 1000
H = 1287/84000
 H = 3 x 429 / 3 x 28000
H = 429/28000

I = 2,8/7 x 21
I = 58,8/7
I = 58,8 x 10 / 7 x 10
I = 588/70
I = 14 x 42 / 14 x 5
I = 42/5