[tex] \frac{x}{y} [/tex]=[tex] \frac{7}{9} [/tex]⇒ x=7k si y=9k
a) [tex] \frac{7k+8 ori 9k}{3 ori 7k+6 ori 9k} [/tex]=[tex] \frac{7k+72k}{21k+54k} [/tex]=[tex] \frac{79k}{75k} = \frac{79}{75} [/tex]
b)[tex] \frac{9 ori 7k-7 ori 9k}{18 ori 7k+14 ori 9k} = \frac{63k-63k}{126k+126k} = \frac{0}{252} = 0[/tex]
c)[tex] \frac{18 ori 7k-14 ori 9k+25}{12+9 ori 7k-7 ori 9k} = \frac{126k-126k+25}{12+63k-63k} = \frac{25}{12} [/tex]
Sper ca te-am ajutat!
