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Exercice 1 :

a) 7/2 > 3/40
b) 5/4 < 3
c) 4 > 8/3
d) 8/2 > 8/3

Exercice 2 :

a) 3/2 + 5/2 = 8/2 = 2 x 4 / 2 x 1 = 4
b) 3/5 + 7/5 = 10/5 = 5 x 2 / 5 x 1 = 5
c) 8/5 - 2/5 = 6/5

Exercice 3 :

a) 3/5 + 4/10 = 3 x 2 / 5 x 2 + 4/10 = 6/10 + 4/10 = 10/10 = 1
b) 5/6 + 4/2 = 5/6 + 4 x 3 / 2 x 3 = 5/6 + 12/6 = 17/6
c) 5/4 - 10/12 = 5 x 3 / 4 x 3 - 10/12 = 15/12 - 10/12 = 5/12

Exercice 4 :

a) 5/2 + 3 = 5 x 3 / 2 x 3 + 3 x  6 / 1 x 6 = 15/6 + 18/6 = 33/6 = 11 x 3 / 2 x 3 = 11/2
b) 5 + 4/3 = 5 x 3 / 1 x 3 + 4/3 = 15/3 + 4/3 = 19/3
c) 6 -10/4 = 6 x 4 / 1 x 4 - 10/4 = 10/4 - 10/4 = 0

Exercice 5 :

a) 5/2 x 3/2 = 15/4
b) 4/5 x 4/3 = 16/15
c) 5/2 x 6/4 = 30/8 = 15 x 2 / 8 x 2 = 15/8
d) 3/2 + 5/10 = 3 x 5 / 2 x 5 + 5/10 = 15/10 + 5/10 = 20/10 = 2 x 10 / 2 x 5 = 2/5
e) 20/12 - 5/3 = 20/12 - 5 x 4 / 3 x 4 = 20/12 - 20/12 = 0
f) 4 x 2/5 = 8/5

Exercice 4 :
a) 5/2 +3 = 5/2 + 6/2 = 11/2 = 5.5
b) 5+ 4/3 = 15/3 + 4/3 = 19/3
c) 6 - 10/4 = 24/4 -10/4 = 14/4 = 7/2 = 3.5

Exercice 5: 
a) 5/2 * 3/2 = 15/4 = 3.75
b) 4/5 * 4/3 = 16/15
c) 5/2 * 6/4 = 30/8 = 15/4 = 3.75
d) 3/2 + 5/10 = 15/10 + 5/10 = 2
e) 20/12 -5/3 = 20/12 - 20/12 = 0
f) 4*2/5 = 8/5 = 1.6