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\({\left (45\cdot \dfrac{9}{10} \right )\cdot \dfrac{10}{61}\raisebox{-1em}{\),\(}\mathrlap{\:+}}\) \({+\left (16\cdot \dfrac{9}{10} \right )\cdot \dfrac{10}{61}\raisebox{-1em}{\),\(}\mathrlap{\,=}}\) \({=\dfrac{10}{61}\cdot \Big(45\cdot \dfrac{9}{10}\raisebox{-1em}{\),\(}\mathrlap{\:+}}\) \({+ 16\cdot \dfrac{9}{10} \Big)\raisebox{-1em}{\),\(}\mathrlap{\,=}}\) \({=\dfrac{10}{61}\cdot \dfrac{9}{10} \cdot \left (45+16\right )\raisebox{-1em}{\),\(}\mathrlap{\,=}}\) \({=\dfrac{10}{61}\cdot \dfrac{9}{10} \cdot 61= 9}\) .

• \(\dfrac{400}{7}\)
• \(57\dfrac{1}{7}\)
• \(59\dfrac{3}{7}\)
• \(\dfrac{318}{7}\)

\(\left (81\cdot \dfrac{50}{63} \right )\cdot \dfrac{72}{83}+\left (2\cdot \dfrac{50}{63} \right )\cdot \dfrac{72}{83}=\) [ ].