а) 29 ⋅ 16\(\frac{1}{4}\) - 15 = 29 ⋅ (24)\(\frac{1}{4}\) - 15 = 29 ⋅ 2 - 15 = 58 - 15 = 43
б) 3√\(\frac{m^6 ⋅ m^{-9}}{m^{12}}\) = 3√\(\frac{m^{-3}}{m^{12}}\) = 3√m-15 = m-5 = \(\frac{1}{m^5}\)
Ответ: а) 43; б) \(\frac{1}{m^5}\)