Aider moi svp Urgent 16 et 17 :( Mercii

Bjr,
Ex 17
a) [tex] \dfrac{63}{99}= \dfrac{9*7}{9*11}= \dfrac{7}{11} [/tex]

b) [tex] \dfrac{45}{84}= \dfrac{3*15}{3*28}= \dfrac{15}{28} [/tex]

c) [tex] \dfrac{76}{120}= \dfrac{4*19}{4*30}= \dfrac{19}{30} [/tex]

d) [tex] \dfrac{125}{135}= \dfrac{5*25}{5*27}= \dfrac{25}{27} [/tex]

Bonjour , 
Ex17 :
a)- 63/99 = 7/11
b)- 45/84 = 15/28
c)- 76/120 = 19/30
d)- 125/135 = 25/27
Ex18 : 
a)- 20/28 = 5/8
b)- 12/39 = 4/13
c)- 75/110 = 15/22
d)- 153/90 = 17/9