03 Упростите выражение:

03 Упростите выражение:

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

г) \( \frac{7}{8} p \cdot \frac{4}{9} k = \frac{28}{72} pk = \frac{7}{18} pk \)

б) \( \frac{8}{9} x \cdot \frac{5}{11} y = \frac{40}{99} xy \)

e) \( 1 \frac{5}{7} x \cdot \frac{5}{12} y = \frac{12}{7} x \cdot \frac{5}{12} y = \frac{60}{84} xy = \frac{5}{7} xy \)

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

г) \( 2 \frac{5}{8} x \cdot 2y \cdot 2 \frac{7}{z} = \frac{21}{8} x \cdot 2y \cdot \frac{21}{z} = \frac{21 \cdot 2 \cdot 21}{8} \frac{xy}{z} = \frac{882}{8} \frac{xy}{z} = \frac{441}{4} \frac{xy}{z} \)