ВАРИАНТ 4. 1. Найдите произведение: a)3$$\frac{3}{4} \cdot 1\frac{1}{7}$$; 6)$$\frac{3}{2} \cdot \frac{2}{9}$$; B)5$$\frac{7}{9} \cdot 2\frac{1}{14}$$.

• a) $$3\frac{3}{4} \cdot 1\frac{1}{7} = \frac{15}{4} \cdot \frac{8}{7} = \frac{15 \cdot 8}{4 \cdot 7} = \frac{15 \cdot 2}{1 \cdot 7} = \frac{30}{7} = 4\frac{2}{7}$$
• б) $$\frac{3}{2} \cdot \frac{2}{9} = \frac{3 \cdot 2}{2 \cdot 9} = \frac{1 \cdot 1}{1 \cdot 3} = \frac{1}{3}$$
• в) $$5\frac{7}{9} \cdot 2\frac{1}{14} = \frac{52}{9} \cdot \frac{29}{14} = \frac{52 \cdot 29}{9 \cdot 14} = \frac{26 \cdot 29}{9 \cdot 7} = \frac{754}{63} = 11\frac{61}{63}$$

Ответ: a) $$4\frac{2}{7}$$; б) $$\frac{1}{3}$$; в) $$11\frac{61}{63}$$