Задание № 1 Сократите дробь: А) (7*3)/(3*14) Б) (3*5*7)/(5*7*9) В) (4*12)/(5*9) Г) (3*4)/(2*15) Д) (14*15)/(21*20)

Задание № 1 Сократите дробь: А) $\frac{7 \cdot 3}{3 \cdot 14} = \frac{7}{14} = \frac{1}{2}$ Б) $\frac{3 \cdot 5 \cdot 7}{5 \cdot 7 \cdot 9} = \frac{3}{9} = \frac{1}{3}$ В) $\frac{4 \cdot 12}{5 \cdot 9} = \frac{4 \cdot 4}{5 \cdot 3} = \frac{16}{15} = 1\frac{1}{15}$ Г) $\frac{3 \cdot 4}{2 \cdot 15} = \frac{1 \cdot 2}{1 \cdot 5} = \frac{2}{5}$ Д) $\frac{14 \cdot 15}{21 \cdot 20} = \frac{2 \cdot 3}{3 \cdot 4} = \frac{2}{4} = \frac{1}{2}$ Задание № 2 1. $\frac{7}{12} + \frac{1}{12} = \frac{8}{12} = \frac{2}{3}$ 2. $\frac{3}{9} + \frac{1}{9} = \frac{4}{9}$ 3. $\frac{9}{11} - \frac{1}{11} = \frac{8}{11}$ 4. $\frac{3}{10} - \frac{2}{10} = \frac{1}{10}$ 5. $\frac{5}{14} + \frac{9}{14} - \frac{3}{14} = \frac{14-3}{14} = \frac{11}{14}$ 6. $\frac{12}{22} + \frac{1}{22} + \frac{3}{22} = \frac{16}{22} = \frac{8}{11}$ 7. $(\frac{13}{29} + \frac{9}{29}) - (\frac{1}{29} + \frac{2}{29}) = \frac{22}{29} - \frac{3}{29} = \frac{19}{29}$ 8. $(\frac{13}{44} + \frac{18}{44} - \frac{4}{44}) + \frac{9}{44} = \frac{27}{44} + \frac{9}{44} = \frac{36}{44} = \frac{9}{11}$