ルートの中
18×18＝2^2×3^4
1/3×(2-√3)/9-(3-2√3)^2/2^2×3^4
＝(2-√3)/27-(3-2√3)^2/2^2×3^4
＝12(2-√3)-(3-2√3)^2/324
＝24-12√3-9+12√3-12/324
＝1/108
1/2√1/108
つまり、
1/2×1/√108＝1/2×6√3/108＝1/2×√3/18＝√3/36
ゴリ押しになっちゃいました…
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