ГДЗ по математике 5 класс Мерзляк ФГОС Задание 1150

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\[1)\ \left( 2\frac{5}{9} - 1\frac{20}{21} \right)\ :1\frac{8}{49} + 1\frac{8}{9}\ :6 =\]

\[= \left( \frac{23^{\backslash 7}}{9} - \frac{41^{\backslash 3}}{21} \right)\ :\frac{57}{49} + \frac{17}{9} \cdot \frac{1}{6} =\]

\[= \frac{161 - 123}{63} \cdot \frac{49}{57} + \frac{17}{54} =\]

\[= \frac{28 + 17}{54} = \frac{45}{54} = \frac{5}{6}\]