ab>0.(a+b)(1/a+1/b)大于等于多少?

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ab>0.(a+b)(1/a+1/b)大于等于多少?ab>0.(a+b)(1/a+1/b)大于等于多少?ab>0.(a+b)(1/a+1/b)大于等于多少?ab>0.(a-b)²>=0a&s

ab>0.(a+b)(1/a+1/b)大于等于多少?
ab>0.(a+b)(1/a+1/b)大于等于多少?

ab>0.(a+b)(1/a+1/b)大于等于多少?
ab>0.
(a-b)²>=0
a²+b²>=2ab
(a+b)(1/a+1/b)
=(a+b)(a+b)/ab
=(a²+b²+2ab)/ab>=4ab/ab=4
所以,ab>0.有:(a+b)(1/a+1/b)>=4

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