✨ Best Answer ✨
3乗根打てないので√で代用
√54=√(3×3×3×2)=3√2
√16=√(2×2×2×2)=2√2
よって3√2+2√2=5√2
√81=√(3×3×3×3)=3√3
3√3-√3=2√3
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