a) $$1\frac{1}{7}$$ от $$\frac{7}{8}$$ = $$\frac{8}{7} \times \frac{7}{8} = \frac{8 \times 7}{7 \times 8} = \frac{56}{56} = 1$$.
б) $$1\frac{4}{5}$$ от 200 = $$\frac{9}{5} \times 200 = \frac{9 \times 200}{5} = \frac{1800}{5} = 360$$.
в) $$1\frac{2}{7}$$ от $$4\frac{2}{3}$$ = $$\frac{9}{7} \times \frac{14}{3} = \frac{9 \times 14}{7 \times 3} = \frac{126}{21} = 6$$.
г) 3,25 от $$\frac{4}{13}$$ = $$\frac{325}{100} \times \frac{4}{13} = \frac{13}{4} \times \frac{4}{13} = \frac{13 \times 4}{4 \times 13} = \frac{52}{52} = 1$$.
Ответ:
a) 1
б) 360
в) 6
г) 1