647. Көбейтудің үлестірімділік қасиетін пайдаланып, есептеңдер: 1) \(3\frac{3}{4}\cdot1\frac{2}{3}+3\frac{3}{4}\cdot\frac{1}{3}\); 2) \(1\frac{2}{5}\cdot2\frac{5}{7}-1\frac{2}{5}\cdot\frac{3}{14}\); 3) \(\frac{1}{9}\cdot1\frac{5}{6}+1\frac{1}{6}\cdot\frac{1}{9}\); 4) \(1\frac{3}{8}\cdot\frac{3}{5}-\frac{3}{5}\cdot\frac{1}{8}\).

1. \(3\frac{3}{4}\cdot(1\frac{2}{3}+\frac{1}{3})=\frac{15}{4}\cdot2=\frac{15}{2}=7\frac{1}{2}\).
2. \(1\frac{2}{5}\cdot(2\frac{5}{7}-\frac{3}{14})=\frac{7}{5}\cdot(\frac{19}{7}-\frac{3}{14})=\frac{7}{5}\cdot\frac{35}{14}=\frac{7}{2}=3\frac{1}{2}\).
3. \(\frac{1}{9}\cdot(1\frac{5}{6}+1\frac{1}{6})=\frac{1}{9}\cdot3=\frac{1}{3}\).
4. \(\frac{3}{5}\cdot(1\frac{3}{8}-\frac{1}{8})=\frac{3}{5}\cdot\frac{5}{4}=\frac{3}{4}\).

Жауап: 1) \(7\frac{1}{2}\); 2) \(3\frac{1}{2}\); 3) \(\frac{1}{3}\); 4) \(\frac{3}{4}\).