ex 15 simplifié les fraction

Exercice 15 : 

a. 1/2 + 1/4 
= [tex] \frac{1 X 2}{2 X 2} [/tex] + 1/4
= 2/4 + 1/4
= 3/4

b. 5/6 + 5/12
= [tex] \frac{5 X 2}{6 X 2} [/tex] + 5/12
= 10/12 + 5/12
= 15/12
= [tex] \frac{15 / 3}{12 / 3} [/tex]
= 5/4

c. 13/14 + 5/7
= 13/14 + [tex] \frac{5 X 2}{7 X 2} [/tex]
= 13/14 + 10/14
= 23/14

d. 3/4 + 5/24
= [tex] \frac{3 X 6}{4 X 6} [/tex] + 5/24
= 18/24 + 5/24
= 23/24

e. 6/7 + 2/35
= [tex] \frac{6 X 5}{7 X 5} [/tex] + 2/35
= 30/35 + 2/35
= 32/35

f. 11/81 + 1/9
= 11/81 + [tex] \frac{1 X 9}{9 X 9} [/tex]
= 11/81 + 9/81
= 20/81