Выполните действия:
а) $3\frac{3}{4} + 1\frac{1}{2}$;
б) $2\frac{5}{6} - 1\frac{5}{12}$;
в) $4 - 1\frac{2}{3}$;
г) $3\frac{2}{7} - \frac{6}{7}$;
д) $1\frac{1}{3} * 4$;
е) $3\frac{1}{4} * \frac{2}{5}$;
ж) $2\frac{1}{4} : 3$;
з) $20 : 2\frac{1}{2}$.
$3\frac{3}{4} + 1\frac{1}{2} = 3\frac{3}{4} + 1\frac{2}{4} = 4\frac{5}{4} = 5\frac{1}{4}$
$2\frac{5}{6} - 1\frac{5}{12} = 2\frac{10}{12} - 1\frac{5}{12} = 1\frac{5}{12}$
$4 - 1\frac{2}{3} = 3\frac{3}{3} - 1\frac{2}{3} = 2\frac{1}{3}$
$3\frac{2}{7} - \frac{6}{7} = 2\frac{9}{7} - \frac{6}{7} = 2\frac{3}{7}$
$1\frac{1}{3} * 4 = \frac{4}{3} * 4 = \frac{16}{3} = 5\frac{1}{3}$
$3\frac{1}{4} * \frac{2}{5} = \frac{13}{4} * \frac{2}{5} = \frac{13}{2} * \frac{1}{5} = \frac{13}{10} = 1\frac{3}{10}$
$2\frac{1}{4} : 3 = \frac{9}{4} * \frac{1}{3} = \frac{3}{4}$
$20 : 2\frac{1}{2} = 20 : \frac{5}{2} = 20 * \frac{2}{5} = 4 * 2 = 8$
Пожауйста, оцените решение