Resposta:
a) 3/9
b) 12/99
c) (23-2)/9 =21/9
d) (1126-1)/999=1125/999
e) (2233-22)/99 =2211/99
f) 0,03939.....=39/990
g) (209-20)/90 =189/90
h) (2090-20)/990 =2070/990
