1) (1/3)⁻² - (-2)⁻³ = 3² - 1/(-2)³ = 9 - 1/(-8) = 9 + 1/8 = 9 1/8;
3) (-10)⁻³ + (2/3)⁻² = 1/(-10)³ + (3/2)² = -1/1000 + 9/4 = -1/1000 + 2250/1000 = 2249/1000 = 2 249/1000 = 2,249.
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