Bonsoir pouvez vous m'aidez a l'exercice 45 merci davance

Bonsoir,

a.
45/14 x 49/60
= 2205/840
= 105 x 21 / 105 x 8
= 21/8

b.
5/3 x 4/5
= 20/15
= 5 x 4 / 5 x 3
= 4/3

c.
45/26 x 65/72
= 2925/1872
= 117 x 25 / 117 x 16
= 25/16

d. 
2 x 9/6
= 18/6
= 6 x 3 / 6 x 1
= 6

e.
7/6 x 6/7
= 42/42
= 1

f.
12,4/6 x 8
= 99,2/6
= 99,2 x 10 / 6 x 10
= 992/60
= 4 x 248 / 4 x 15
= 248/15

g.
2,5/3 x 3/0,5
= 7,5/1,5
= 7,5 x 10 / 1,5 x 10
= 75/15
= 15 x 5 / 15 x 1
= 5

h.
5,6 x 9/0,7
= 50,4/7
= 50,4 x 10 / 7 x 10
= 504/70
= 14 x 36 / 14 x 5
= 36/5

i.
0,55 x 2/11
= 1,1/11
= 1,1 x 10 /  11 x 10
= 11/110
= 11 x 1 / 11 x 10
= 1/10