急いで有理化しないほうがいいタイプ
[(√5)/{(√3)+2}]-[(√5)/{(√3)-2}]
={(√5)/(2+√3)}+{(√5)/(2-√3)}
=[(√5)(2-√3)/{(2+√3)(2-√3)}]+[(√5)(2+√3)/(2-√3)(2+√3)]
(2+√3)(2-√3)はきれいに消えるよ
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