|№2 Вычислите. 3 3 2)- 88 3)(2) 2424 - №3 Выполните умножение 25:55

Ответ: 5/3

1. \[\left(\frac{5}{7}\right)^2 = \frac{5}{7} \cdot \frac{5}{7} = \frac{25}{49}\]
2. \(\frac{25}{49} : 5 = \frac{25}{49} : \frac{5}{1} = \frac{25}{49} \cdot \frac{1}{5} = \frac{25}{49 \cdot 5} = \frac{5}{49}\)
3. \(\frac{5}{49} - \frac{2}{49} = \frac{3}{49}\)
4. \(\left(\frac{3}{8}\right)^2 = \frac{3}{8} \cdot \frac{3}{8} = \frac{9}{64}\)
5. \(\frac{7}{8} : \frac{9}{64} = \frac{7}{8} \cdot \frac{64}{9} = \frac{7 \cdot 64}{8 \cdot 9} = \frac{7 \cdot 8}{9} = \frac{56}{9}\)
6. \(\left(2\frac{3}{4}\right)^2 = \left(\frac{11}{4}\right)^2 = \frac{11}{4} \cdot \frac{11}{4} = \frac{121}{16}\)
7. \(\frac{121}{16} - 2\frac{5}{16} = \frac{121}{16} - \frac{37}{16} = \frac{84}{16} = \frac{21}{4} = 5\frac{1}{4}\)
8. \(\left(\frac{2}{3}\right)^2 = \frac{2}{3} \cdot \frac{2}{3} = \frac{4}{9}\)
9. \(\frac{4}{9} : \frac{2}{3} = \frac{4}{9} \cdot \frac{3}{2} = \frac{4 \cdot 3}{9 \cdot 2} = \frac{2 \cdot 1}{3 \cdot 1} = \frac{2}{3}\)
10. \(1-\frac{2}{3} = \frac{3}{3}-\frac{2}{3}=\frac{1}{3}\)
11. \(4 + \frac{1}{3} = \frac{12}{3} + \frac{1}{3} = \frac{13}{3} = 4\frac{1}{3}\)
12. \(5 - 4\frac{1}{3} = 5 - \frac{13}{3} = \frac{15}{3} - \frac{13}{3} = \frac{2}{3}\)
13. \(\frac{7}{3} - \frac{2}{3} = \frac{5}{3} = 1\frac{2}{3}\)

Ответ: 5/3