Решение:
- 1) 10⁻¹ + 5⁻² = \( \frac{1}{10} + \frac{1}{25} \) = \( \frac{5+2}{50} \) = \( \frac{7}{50} \)
- 2) (2/3)⁻¹ + (-1,7)⁰ - 2⁻³ = \( \frac{3}{2} + 1 - \frac{1}{8} \) = \( \frac{12+8-1}{8} \) = \( \frac{19}{8} \)
- 3) (3/4)⁻² = \( \frac{4^2}{3^2} \) = \( \frac{16}{9} \)
- 2⁻³ = \( \frac{1}{2^3} \) = \( \frac{1}{8} \)
Ответ: 1) 7/50, 2) 19/8, 3) 16/9, 2⁻³ = 1/8