Merci de bien vouloir m’aider je n’y arrive pas du tout

Bonsoir,

D = 3/7 : 9/14

D = 3/7 x 14/9

D = 42/63

D = (7 x 6) / (7 x 9)

D = 6/9

O = 22/5 : 11

O = 22/5 x 1/11

O = 22/55

O = (11 x 2) / (11 x 5)

O = 2/5

H = 13/5 : 1/5

H = 13/5 x 5

H = 65/5

H = (5 x 13) / (5 x 1)

H = 13

A = 13 : 1/5

A = 13 x 5

A = 65

K = 25/49 x 42/15

K = 1 050/735

K = (105 x 10) / (105 x 7)

K = 10/7

I = 21/32 x 16/33

I = 336/1 056

I = (48 x 7) / (48 x 22)

I = 7/22

E = 36/35 : 48/65

E = 36/35 x 65/48

E = 2 340/1 680

E = (60 x 39) / (60 x 28)

E = 39/28

V = 3/7 : 9/14 --> Pareil que D