Вычисли

• \(4\)
• \(1\dfrac{4}{5}\)
• \(6\dfrac{5}{9}\)
• \(3\dfrac{6}{7}\)
• \(7\)
• \(2\)

\(2\dfrac{3}{7}+1\dfrac{4}{7}=\) [ ]

\(4\dfrac{2}{5}-2\dfrac{3}{5}=\) [ ]

\(8-1\dfrac{4}{9}=\) [ ]