⁴√54 * ⁴√24=⁴√3^2*6 *⁴√2^2*6=2√18*2√12=2√3^2*2 * 2√2^2*3=6 (-3 * ⁵√ 1/9)⁵=-3⁵*1/3^2=-3^3=-1/27 ∛128 / ∛2=∛64=4