Выполните умножение смешанных чисел и дробей.

1. Выполните умножение: а) $1\frac{2}{7} \cdot 1\frac{1}{4} = \frac{9}{7} \cdot \frac{5}{4} = \frac{45}{28} = 1\frac{17}{28}$ б) $4\frac{2}{3} \cdot \frac{2}{5} = \frac{14}{3} \cdot \frac{2}{5} = \frac{28}{15} = 1\frac{13}{15}$ в) $1\frac{3}{5} \cdot 3\frac{3}{4} = \frac{8}{5} \cdot \frac{15}{4} = \frac{2 \cdot 4}{5} \cdot \frac{3 \cdot 5}{4} = \frac{2 \cdot 3}{1} = 6$ г) $\frac{4}{9} \cdot 2\frac{3}{4} = \frac{4}{9} \cdot \frac{11}{4} = \frac{1}{9} \cdot \frac{11}{1} = \frac{11}{9} = 1\frac{2}{9}$ д) $2\frac{3}{4} \cdot \frac{4}{11} = \frac{11}{4} \cdot \frac{4}{11} = 1$ е) $1\frac{3}{4} \cdot 1\frac{5}{7} = \frac{7}{4} \cdot \frac{12}{7} = \frac{1}{4} \cdot \frac{12}{1} = \frac{12}{4} = 3$ ж) $3\frac{1}{4} \cdot 4 = \frac{13}{4} \cdot 4 = 13$ з) $10 \cdot 5\frac{2}{5} = 10 \cdot \frac{27}{5} = 2 \cdot 27 = 54$ и) $3\frac{5}{6} \cdot 1\frac{7}{23} = \frac{23}{6} \cdot \frac{30}{23} = \frac{1}{6} \cdot \frac{30}{1} = \frac{30}{6} = 5$ к) $1\frac{2}{3} \cdot 2\frac{2}{5} = \frac{5}{3} \cdot \frac{12}{5} = \frac{1}{3} \cdot \frac{12}{1} = \frac{12}{3} = 4$ л) $7\frac{3}{11} \cdot 2\frac{19}{40} = \frac{80}{11} \cdot \frac{99}{40} = \frac{2}{1} \cdot \frac{9}{1} = 18$ м) $2\frac{1}{2} \cdot 2\frac{2}{15} = \frac{5}{2} \cdot \frac{32}{15} = \frac{1}{1} \cdot \frac{16}{3} = \frac{16}{3} = 5\frac{1}{3}$ н) $0 \cdot 1\frac{4}{9} = 0$ о) $1\frac{5}{7} \cdot 1 = 1\frac{5}{7}$ п) $3\frac{8}{9} \cdot 0 = 0$