已知a>0,b>0,a+b=1,求证:(a+1⼀a)(b+1⼀b)≥25⼀4

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2024-12-26 18:56:59
推荐回答(1个)
回答1:

左式=ab+a/b+1/ab+b/a
=(a2b2+a2+1+b2)/ab
=[a2b2+(1-2ab)+1]/ab
=[(ab-1)2+1]/ab
(ab-1)2+1≥25/16,0