若a+b=5,ab=4 则根号a加根号b分之根号a减根号b=?

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根号a加根号b分之根号a减根号b=±√[√a-√b)²/(√a+√b)²]
=±√[a+b-2√ab)/(a+b+2√ab)]
=±√(5-4)/(5+4)
=±1/3希望你能看懂,望采纳,赞同,谢谢!