(-2а⁵b)³ / (2a³)⁷ = -8a¹⁵b³ / 128a²¹ = –b³ / 16a⁶ или –1/16а⁻⁶b³.
P.S.:
(a³)⁷ = a³*⁷ = a²¹
a¹⁵/a²¹ = a¹⁵⁻²¹ = a⁻⁶ = 1/a⁶
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(-2а⁵b)³ / (2a³)⁷ = -8a¹⁵b³ / 128a²¹ = –b³ / 16a⁶ или –1/16а⁻⁶b³.
P.S.:
(a³)⁷ = a³*⁷ = a²¹
a¹⁵/a²¹ = a¹⁵⁻²¹ = a⁻⁶ = 1/a⁶