ГДЗ по математике 6 класс Ерина Виленкин рабочая тетрадь Часть 1, 2 Часть 1 | Страница 65

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\[\textbf{а)}\ 1\frac{3}{7} \cdot 1\frac{1}{4} = \frac{10}{7} \cdot \frac{5}{4} = \frac{10 \cdot 5}{7 \cdot 4} =\]

\[= \frac{50}{28} = 1\frac{11}{14}\]

\[\textbf{б)}\ 3\frac{1}{5} \cdot \frac{3}{8} = \frac{16}{5} \cdot \frac{3}{8} = \frac{16 \cdot 3}{5 \cdot 8} = \frac{6}{5} =\]

\[= 1\frac{1}{5}\]

\[\textbf{в)}\ 9 \cdot 4\frac{1}{6} = \frac{9}{1} \cdot \frac{25}{6} = \frac{9 \cdot 25}{6} =\]

\[= \frac{75}{2} = 37\frac{1}{2}\]

\[\textbf{г)}\ 3\frac{17}{21} \cdot 3\frac{1}{8} = \frac{80}{21} \cdot \frac{25}{8} =\]

\[= \frac{80 \cdot 25}{21 \cdot 8} = \frac{250}{21} = 11\frac{19}{21}\]

\[\textbf{д)}\ 16\frac{2}{3} \cdot 1\frac{1}{5} = \frac{50}{3} \cdot \frac{6}{5} = 20\ \ \ \ \ \ \ \ \ \ \ \ \]

\[2\frac{3}{4} \cdot 3\frac{1}{3} = \frac{11}{4} \cdot \frac{10}{3} = \frac{55}{6} = 9\frac{1}{6}\]

\[\textbf{е)}\ 5\frac{2}{5} \cdot 3\frac{1}{3} = \frac{27}{5} \cdot \frac{10}{3} = 18\ \ \ \ \ \ \ \ \ \ \ \ \ \]

\[3\frac{1}{3} \cdot 3\frac{3}{5} = \frac{10}{3} \cdot \frac{18}{5} = 12\]

\[\textbf{ж)}\ 1\frac{2}{7} \cdot 1\frac{1}{4} = \frac{9}{7} \cdot \frac{5}{4} = \frac{45}{28} = 1\frac{17}{28}\text{\ \ \ \ \ \ \ \ \ \ }\]

\[6\frac{1}{2} \cdot 1\frac{1}{39} = \frac{13}{2} \cdot \frac{40}{39} = \frac{20}{3} = 6\frac{2}{3}\]

\[\textbf{з)}\ 33\frac{1}{3} \cdot 1\frac{1}{5} = \frac{100}{3} \cdot \frac{6}{5} = 40\ \ \ \ \ \ \ \ \ \ \ \]

\[2\frac{4}{5} \cdot 6\frac{3}{7} = \frac{14}{5} \cdot \frac{45}{7} = 18\]

\[\textbf{и)}\ 2\frac{2}{5} \cdot 13\frac{1}{3} = \frac{12}{5} \cdot \frac{40}{3} = 32\ \ \ \ \ \ \ \ \ \ \]

\[3\frac{1}{16} \cdot 1\frac{5}{7} = \frac{49}{16} \cdot \frac{12}{7} = \frac{21}{4} = 5\frac{1}{4}\]

\[к)\ 5\frac{3}{4} \cdot 1\frac{1}{7} = \frac{23}{4} \cdot \frac{8}{7} = \frac{46}{7} = 6\frac{4}{7}\text{\ \ \ \ \ \ \ \ \ \ \ \ }\]

\[3\frac{7}{9} \cdot 1\frac{1}{17} = \frac{34}{9} \cdot \frac{18}{17} = 4\]