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2. 1/4 - 1/16 = 4/16 - 1/16 = 3/16
3. -1/27 - 1/81 + 9 = -3/81 -1/81 + 9 = -4/81 + 9 = 725/81 = 8 77/81
4. -8/27
2.
2⁻² - 2⁻⁴
3.
(-3)⁻³ - (-3)⁻⁴ + 9
(-3)⁻³ (1 - 3⁻¹) + 9
1/-27 (1 - 1/3) + 9
1/(-27) x (2/3) + 9
2/-81 + 9
9 - 2/81
8 79/81
4.
()³