Выбери верные ответы

1. \(\textcolor{white}{\boxed{\textcolor{black}{\dfrac{5b}{b-2}+\dfrac{4b}{2-b}=}}}\) [ \(\frac{9b}{b-2}\) | \(\frac{1}{2-b}\) | \(\frac{b}{b-2}\) ]
2. \(\textcolor{white}{\boxed{\textcolor{black}{\dfrac{3}{a}-\dfrac{2}{a-4}=}}}\) [ \(\frac{1}{a\left(a-4\right)}\) | \(\frac{a-12}{a\left(a-4\right)}\) | \(\frac{a}{a-4}\) ]
3. \(\textcolor{white}{\boxed{\textcolor{black}{\dfrac{1}{y^2-2y}-\dfrac{1}{y-2}=}}}\) [ \(\frac{1-y}{y\left(y-2\right)}\) | \(\frac{y}{y-2}\) | \(\frac{1}{y\left(y-2\right)}\) ]