a)
[tex] \frac{20 \div 10}{30 \div 10 } = \frac{2}{3} [/tex]
[tex] \frac{5}{6} different \: que \: \frac{2}{3} [/tex]
b)
[tex] \frac{12 \div 3}{ - 21 \div 3} = \frac{4}{ - 7} [/tex]
donc -4/7=12/-21
c)
[tex] \frac{63 \div 9}{ - 36 \div 9} = \frac{7}{ - 4} [/tex]
donc 63/-36=-7/4
d)
[tex] \frac{ - 45 \div 5}{55 \div 5} = \frac{ - 9}{11} [/tex]
-9/11 different que 1/9
