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(-4)⁵ . (-4)⁶ : (-4)⁸ = (-4)⁵⁺⁶ : ( -4)⁸ = ( -4)¹¹ : ( -4)⁸ = ( -4)¹¹ . ( -4)⁻⁸ = ( -4)¹¹⁻⁸ = ( -4)³
B)
((-5)⁶ . ( -5) )² : ( -5)¹¹ = (( -5)⁶⁺¹)² : ( -5)¹¹ = ((-5)⁷)² : (-5)¹¹ = ( -5)¹⁴ : (-5)¹¹ = ( -5) ¹⁴⁻¹¹ = ( -5) ³
C)
((-3)⁹ . ( -2)⁸) : (( -3)⁷). ( -2)⁵) = ((-3)⁹. ( -3)⁻⁷ . (-2)⁸ . ( -2)⁻⁵) = (( -3)⁹⁻⁷ . ( -2)⁸⁻⁵) =
(( -3)². ( -2)³)