2011 National Question 3 Single-choice Differentiating 2011_退役省自主命题 (2011·文) 3.设 $0<a<b$ ,则下列不等式中正确的是 A. $a<b<\sqrt{a b}<\frac{a+b}{2}$B. $a<\sqrt{a b}<\frac{a+b}{2}<b$C. $a<\sqrt{a b}<b<\frac{a+b}{2}$D. $\sqrt{a b}<a<\frac{a+b}{2}<b$ Answer keyB ☆ SaveCan't do it, show the explanation查看原卷 →