81 = 3⁴
729 = 3⁶
¹⁸√729*⁶√81 = ¹⁸√3⁶*⁶√3⁴ = ¹⁸√3⁶*¹⁸√3¹² = ¹⁸√(3⁶*3¹²) = ¹⁸√ 3¹⁸ = 3
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81 = 3⁴
729 = 3⁶
¹⁸√729*⁶√81 = ¹⁸√3⁶*⁶√3⁴ = ¹⁸√3⁶*¹⁸√3¹² = ¹⁸√(3⁶*3¹²) = ¹⁸√ 3¹⁸ = 3