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a]
⁴√(2√64)=⁴√(2*8)=⁴√16=2
b]
√(-2∛-8)=√(-2*(-2)]=√4=2
c]
⁷√[-⁶√-⁵√(-1)]=-1
d]
( ( ∛( ⁵√3)³)⁵=(⁵√3)⁵=3