Выполни умножение и найди значение выражения.

Задание 2.303 a) $3\frac{3}{4} \cdot 1\frac{3}{5} = \frac{15}{4} \cdot \frac{8}{5} = \frac{3}{1} \cdot \frac{2}{1} = 6$ б) $1\frac{1}{23} \cdot 3\frac{5}{6} = \frac{24}{23} \cdot \frac{23}{6} = \frac{4}{1} \cdot \frac{1}{1} = 4$ в) $1\frac{15}{29} \cdot 1\frac{9}{20} = \frac{44}{29} \cdot \frac{29}{20} = \frac{11}{1} \cdot \frac{1}{5} = \frac{11}{5} = 2\frac{1}{5}$ г) $8\frac{23}{34} \cdot \frac{17}{59} = \frac{295}{34} \cdot \frac{17}{59} = \frac{5}{2} \cdot \frac{1}{1} = \frac{5}{2} = 2\frac{1}{2}$ д) $2\frac{1}{3} \cdot 14\frac{4}{7} = \frac{7}{3} \cdot \frac{102}{7} = \frac{1}{1} \cdot \frac{34}{1} = 34$ е) $6\frac{4}{9} \cdot 3\frac{6}{13} = \frac{58}{9} \cdot \frac{45}{13} = \frac{58}{1} \cdot \frac{5}{13} = \frac{290}{13} = 22\frac{4}{13}$ з) $5\frac{5}{45} \cdot 9 \cdot 15 = \frac{230}{45} \cdot 9 \cdot 15 = \frac{46}{9} \cdot 9 \cdot 15 = 46 \cdot 15 = 690$ Задание 2.304 a) $\frac{3}{7} - a$ при $a = \frac{3}{7}$; $\frac{3}{7} - \frac{3}{7} = 0$ a при $a = 2\frac{1}{7}$; $\frac{3}{7} - 2\frac{1}{7} = \frac{3}{7} - \frac{15}{7} = -\frac{12}{7} = -1\frac{5}{7}$ a при $a = 2\frac{28}{33}$; $\frac{3}{7} - 2\frac{28}{33} = \frac{3}{7} - \frac{94}{33} = \frac{99}{231} - \frac{658}{231} = -\frac{559}{231} = -2\frac{97}{231}$ б) $\frac{5}{12} - b$ при $b = \frac{1}{5}$; $\frac{5}{12} - \frac{1}{5} = \frac{25}{60} - \frac{12}{60} = \frac{13}{60}$ $\frac{5}{12} - b$ при $b = 1\frac{1}{5}$; $\frac{5}{12} - 1\frac{1}{5} = \frac{5}{12} - \frac{6}{5} = \frac{25}{60} - \frac{72}{60} = -\frac{47}{60}$ $\frac{5}{12} - b$ при $b = 2\frac{2}{5}$; $\frac{5}{12} - 2\frac{2}{5} = \frac{5}{12} - \frac{12}{5} = \frac{25}{60} - \frac{144}{60} = -\frac{119}{60} = -1\frac{59}{60}$