Cześć!
a)
[tex]\dfrac{30}{102}=\dfrac{30:2}{102:2}=\dfrac{15}{51}=\dfrac{15:3}{51:3}=\boxed{\frac{5}{17}}\\[/tex]
b)
[tex]\dfrac{27}{117}=\dfrac{27:3}{117:3}=\dfrac{9}{39}=\dfrac{9:3}{39:3}=\boxed{\frac{3}{13}}\\[/tex]
c)
[tex]\dfrac{45}{165}=\dfrac{45:5}{165:5}=\dfrac{9}{33}=\dfrac{9:3}{33:3}=\boxed{\frac{3}{11}}\\[/tex]
d)
[tex]\dfrac{54}{252}=\dfrac{54:2}{252:2}=\dfrac{27}{126}=\dfrac{27:3}{126:3}=\dfrac{9}{42}=\dfrac{9:3}{42:3}=\boxed{\frac{3}{14}}\\[/tex]
