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若a,b∈R,且ab>0,则下列不等式中,恒成立的是

发布时间:2021-07-21

A.a2+b2>2ab

B.a+b≥2http://picflow.koolearn.com/upload/papers/g02/20110824/20110824153948968909.gif

C.http://picflow.koolearn.com/upload/papers/g02/20110824/201108241539489681079.gif

D.http://picflow.koolearn.com/upload/papers/g02/20110824/201108241539490461007.gif

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