ГДЗ Математика 6 клас Істер — Вправа 358

1) $1\frac{5}{7} \cdot 1\frac{2}{3} = \frac{12}{7} \cdot \frac{5}{3} = \frac{4 \cdot 5}{7} = \frac{20}{7} = 2\frac{6}{7};$

2) $3\frac{3}{8} \cdot 1\frac{1}{15} = \frac{27}{8} \cdot \frac{16}{15} = \frac{9 \cdot 2}{1 \cdot 5} = \frac{18}{5} = 3\frac{3}{5};$

3) $1\frac{1}{7} \cdot 1\frac{3}{11} = \frac{8}{7} \cdot \frac{14}{11} = \frac{8 \cdot 2}{11} = \frac{16}{11} = 1\frac{5}{11};$

4) $9\frac{3}{8} \cdot 2\frac{2}{5} = \frac{75}{8} \cdot \frac{12}{5} = \frac{15 \cdot 3}{2} = \frac{45}{2} = 22\frac{1}{2};$

5) $2\frac{5}{11} \cdot 1\frac{19}{36} = \frac{27}{11} \cdot \frac{55}{36} = \frac{3 \cdot 5}{4} = \frac{15}{4} = 3\frac{3}{4};$

6) $1\frac{5}{36} \cdot 5\frac{5}{8} = \frac{41}{36} \cdot \frac{45}{8} = \frac{41 \cdot 5}{4 \cdot 8} = \frac{205}{32} = 6\frac{13}{32};$

7) $4\frac{5}{12} \cdot 7\frac{1}{2} \cdot \frac{6}{53} = \frac{53}{12} \cdot \frac{15}{2} \cdot \frac{6}{53} = \frac{1 \cdot 15 \cdot 1}{2 \cdot 2 \cdot 1} = \frac{15}{4} = 3\frac{3}{4};$

8) $2\frac{3}{7} \cdot 1\frac{3}{17} \cdot 3\frac{1}{16} = \frac{17}{7} \cdot \frac{20}{17} \cdot \frac{49}{16} = \frac{1 \cdot 5 \cdot 7}{1 \cdot 1 \cdot 4} = \frac{35}{4} = 8\frac{3}{4}.$