1/根号(3+2×根号2)+1/根号(5+2×根号6)+1/根号(7+4×根号3)

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=(3-2√2)/(3+2√2)(3-2√2)+(5-2√6)/纤升掘(5+2√6)(5-2√6)+(7-4√3)/(7+4√3)(7-4√3)
=3-2√2+5-2√6+7-4√笑悔3
=15-2√2-2√毁核6-4√3

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