Answer
5
Solution
[5 (8^1/3 + 27^1/3)^3]^1/4
= [5 ((2^3)^1/3) + (3^3)^1/3)^3]^1/4
= [5((2+3)^3)1/4
= (5×5^3)^1/4
= (5^4)^1/4
= 5
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