Question

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Answer 1

Ответ:

D)

Пошаговое объяснение:

$\left( {3 + \displaystyle\frac{1}{5}} \right):\left( {\displaystyle\frac{3}{7} - \displaystyle\frac{2}{5} + 1} \right) = \displaystyle\frac{{3 \cdot 5 + 1}}{5}:\displaystyle\frac{{3 \cdot 5 - 2 \cdot 7 + 7 \cdot 5}}{{7 \cdot 5}} = \displaystyle\frac{{16}}{5}:\displaystyle\frac{{36}}{{35}} =\\\\= \displaystyle\frac{{16}}{5} \cdot \displaystyle\frac{{35}}{{36}} = \displaystyle\frac{{4 \cdot 4}}{5} \cdot \displaystyle\frac{{5 \cdot 7}}{{4 \cdot 9}} = \displaystyle\frac{{28}}{9} = 3\displaystyle\frac{1}{9}.$