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a)
= (2*3)⁷ : 6⁵ =
= 6⁷ : 6⁵ =
= 6² = 36
b)
= (-1/2)⁷ *(1/2)⁻⁷ =
= -(1/2)⁷ *(1/2)⁻⁷ =
= - (1/2)⁰ =
= - 1