2. Упростите выражение: 1) $$ \frac{2}{3}a \cdot \frac{7}{12}b$$ 2) $$ \frac{8}{9}x \cdot 1\frac{4}{5}y$$ 3) $$ 5m \cdot 2\frac{6}{11}n \cdot 2\frac{5}{14}k $$ 3. Упростите выражение: 1) $$ 5\frac{9}{14}x + \frac{11}{28}x + \frac{11}{42}x $$ 2) $$ 8\frac{13}{18}m - 4\frac{7}{12}m + 5\frac{5}{6}m $$

2. Упростите выражение:

1) $$\frac{2}{3}a \cdot \frac{7}{12}b = \frac{2 \cdot 7}{3 \cdot 12}ab = \frac{14}{36}ab = \frac{7}{18}ab$$

2) $$\frac{8}{9}x \cdot 1\frac{4}{5}y = \frac{8}{9}x \cdot \frac{9}{5}y = \frac{8 \cdot 9}{9 \cdot 5}xy = \frac{8}{5}xy = 1\frac{3}{5}xy$$

3) $$5m \cdot 2\frac{6}{11}n \cdot 2\frac{5}{14}k = 5m \cdot \frac{28}{11}n \cdot \frac{33}{14}k = \frac{5 \cdot 28 \cdot 33}{11 \cdot 14}mnk = \frac{5 \cdot 2 \cdot 3}{1}mnk = 30mnk$$

3. Упростите выражение:

1) $$5\frac{9}{14}x + \frac{11}{28}x + \frac{11}{42}x = \frac{79}{14}x + \frac{11}{28}x + \frac{11}{42}x = \frac{79 \cdot 6 + 11 \cdot 3 + 11 \cdot 2}{84}x = \frac{474 + 33 + 22}{84}x = \frac{529}{84}x = 6\frac{25}{84}x$$

2) $$8\frac{13}{18}m - 4\frac{7}{12}m + 5\frac{5}{6}m = \frac{157}{18}m - \frac{55}{12}m + \frac{35}{6}m = \frac{157 \cdot 2 - 55 \cdot 3 + 35 \cdot 6}{36}m = \frac{314 - 165 + 210}{36}m = \frac{359}{36}m = 9\frac{35}{36}m$$