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Simplify the expressions:
(a) #(9a^2)^(1/3)/6^4 ×(4b^2)^(1/3)/5a#

(b) #root3((27x^3 y^9)/(x^6 y^3 ))#

(c) #(root5(32y^10 k^15 2^10 ) )/root4((16y^12 k^16 2^4 ) )#