Вычисли разность дробей из варианта 1 под буквой а

Вариант 1 1. а) $\frac{1}{2} - \frac{1}{7} = \frac{7}{14} - \frac{2}{14} = \frac{5}{14}$ б) $\frac{3}{5} - \frac{4}{15} = \frac{9}{15} - \frac{4}{15} = \frac{5}{15} = \frac{1}{3}$ в) $1 - \frac{2}{9} = \frac{9}{9} - \frac{2}{9} = \frac{7}{9}$ г) $5 - 1\frac{3}{5} = 5 - \frac{8}{5} = \frac{25}{5} - \frac{8}{5} = \frac{17}{5} = 3\frac{2}{5}$ д) $1\frac{1}{3} - \frac{1}{2} = \frac{4}{3} - \frac{1}{2} = \frac{8}{6} - \frac{3}{6} = \frac{5}{6}$ е) $3\frac{1}{6} - 1\frac{1}{3} = \frac{19}{6} - \frac{4}{3} = \frac{19}{6} - \frac{8}{6} = \frac{11}{6} = 1\frac{5}{6}$ 2. $\frac{7}{8} - \frac{5}{24} - \frac{1}{3} = \frac{21}{24} - \frac{5}{24} - \frac{8}{24} = \frac{8}{24} = \frac{1}{3}$ Вариант 2 1. а) $\frac{1}{3} - \frac{1}{5} = \frac{5}{15} - \frac{3}{15} = \frac{2}{15}$ б) $\frac{3}{4} - \frac{7}{12} = \frac{9}{12} - \frac{7}{12} = \frac{2}{12} = \frac{1}{6}$ в) $1 - \frac{3}{11} = \frac{11}{11} - \frac{3}{11} = \frac{8}{11}$ г) $7 - 2\frac{1}{3} = 7 - \frac{7}{3} = \frac{21}{3} - \frac{7}{3} = \frac{14}{3} = 4\frac{2}{3}$ д) $1\frac{1}{4} - \frac{1}{3} = \frac{5}{4} - \frac{1}{3} = \frac{15}{12} - \frac{4}{12} = \frac{11}{12}$ е) $2\frac{1}{8} - 1\frac{1}{4} = \frac{17}{8} - \frac{5}{4} = \frac{17}{8} - \frac{10}{8} = \frac{7}{8}$ 2. $\frac{5}{7} - \frac{3}{28} - \frac{1}{4} = \frac{20}{28} - \frac{3}{28} - \frac{7}{28} = \frac{10}{28} = \frac{5}{14}$ Умножение дробей. Вариант 1 1. а) $\frac{15}{16} * \frac{12}{25} = \frac{3}{4} * \frac{3}{5} = \frac{9}{20}$ б) $\frac{4}{5} * 40 = \frac{4}{5} * \frac{40}{1} = \frac{4}{1} * \frac{8}{1} = 32$ в) $24 * \frac{3}{8} = \frac{24}{1} * \frac{3}{8} = \frac{3}{1} * \frac{3}{1} = 9$ г) $1\frac{2}{3} * 2\frac{1}{5} = \frac{5}{3} * \frac{11}{5} = \frac{1}{3} * \frac{11}{1} = \frac{11}{3} = 3\frac{2}{3}$ 2. а) $\frac{6}{7} * \frac{4}{9} * \frac{5}{16} = \frac{2}{7} * \frac{4}{3} * \frac{5}{16} = \frac{1}{7} * \frac{1}{3} * \frac{5}{2} = \frac{5}{42}$ б) $\frac{2}{3} * \frac{6}{7} + \frac{8}{21} * \frac{1}{4} = \frac{2}{1} * \frac{2}{7} + \frac{2}{21} * \frac{1}{1} = \frac{4}{7} + \frac{2}{21} = \frac{12}{21} + \frac{2}{21} = \frac{14}{21} = \frac{2}{3}$