Răspuns :
a) [tex]\dfrac{15}{10}=\dfrac{3}{2}[/tex](prin 5)
b) [tex]\dfrac{3}{21}={1}{7}[/tex](prin 3)
c) [tex]=\dfrac{4}{10}=\dfrac{2}{5}[/tex](prin 2)
d) [tex]\dfrac{42}{30}=\dfrac{7}{5}[/tex](prin 6)
e) [tex]\dfrac{105}{135}=\dfrac{21}{23}[/tex](prin 5)
f) [tex]\dfrac{90}{72}=\dfrac{5}{4}[/tex](prin 18)