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Step-by-step explanation:
√(√(√(47+21√5/2)))
= √(√(√(47 + 21*√2.5)))
= √(√(√(47 + 21*1.58)))
= √(√(√(47 + 33.6)))
= √(√(√(47 + 34)))
= √(√(√(81)))
= √(√(9))
= √3
= 1.73
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