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= 5¹²*(9-5)*2⁹/(2⁹*5¹²) = 5¹²*4*2⁹/(2⁹*5¹²) = 2¹¹/2⁹ = 4
2.
= 2⁻³⁶*2³º =2⁻⁶= 1/64
3.
= (2*3)¹⁷*3⁻¹⁵/2¹⁶ = 2*3² = 18
4.
343⁴*8⁻⁵/28¹¹ = (7¹²)*8⁻⁵/(7*4)¹¹ = 7*8⁻⁵/4¹¹ =
= 7/(4¹¹*(4*2)⁵) = 7/(2²²*2¹⁵) = 7/2³⁷ = 7*2⁻³⁷