Приведи дроби к общему знаменателю

Например:

\(\dfrac{4}{15}=\dfrac{^{1/}4}{15}=\dfrac{4}{15}\)

\(\dfrac{3}{5}=\dfrac{^{3/}3}{5}=\dfrac{9}{15}\)

1. \(\dfrac{3}{5}=\dfrac{a}{b}\)
   \(a=\) [ ]

   \(b=\) [ ]

   \(\dfrac{1}{4}=\dfrac{c}{b}\)

   \(c=\) [ ]

   \(b=\) [ ]

2. \(\dfrac{2}{15}=\dfrac{a}{b}\)
   \(a=\) [ ]

   \(b=\) [ ]

   \(\dfrac{1}{10}=\dfrac{c}{b}\)

   \(c=\) [ ]

   \(b=\) [ ]

3. \(\dfrac{11}{30}=\dfrac{a}{b}\)
   \(a=\) [ ]

   \(b=\) [ ]

   \(\dfrac{9}{20}=\dfrac{c}{b}\)

   \(c=\) [ ]

   \(b=\) [ ]