%0 Journal Article %T 关于,Neuman-Sándor,平均的两个最佳不等式 %A 杨月英 %A 马萍 %J 华东师范大学学报(自然科学版) %D 2018 %R 10.3969/j.issn.1000-5641.2018.04.003 %X 摘要 ZHAIYAO{运用实分析方法,研究了Neuman-Sándor平均M(a,b)与第二类反调和平均D(a,b)和调和根平方平均H(a,b)(及调和平均,H(a,b))凸组合的序关系.发现了最大值λ1,λ2∈(0,1)和最小值μ1,μ2∈(0,1)使得双边不等式 λ1D(a,b)+(1-λ1)H(a,b)<M(a,b)<μ1D(a,b)+(1-μ1)H(a,b), λ2D(a,b)+(1-λ2) H(a,b)<M(a,b)<μ2D(a,b)+(1-μ2) H(a,b) 对所有a,b>0且a≠b成立.</br>Abstract:This paper deals with the inequalities involving Neuman-Sándor means using methods of real analysis. The convex combinations of the second contra-harmonic mean D(a, b) and the harmonic root-square mean H(a, b) (or harmonic mean H(a,b)) for the Neuman-Sándor mean M(a, b) are discussed. We find the maximum values λ1, λ2 ∈ (0, 1) and the minimum values μ1, μ2 ∈ (0, 1) such that the two-sided inequalities λ1D(a, b) + (1-λ1)H(a, b) < M(a, b) < μ1D(a, b) + (1-μ1)H(a, b), λ2D(a, b) + (1-λ2)H(a,b) < M(a, b) < μ2D(a, b) + (1-μ2)H(a,b) hold for all a, b > 0 with a≠b. %K Neuman-Sá %K ndor平均 %K 反调和平均 %K 根平方平均 %K 调和平均 %K 不等式< %K /br> %K Key words: Neuman-Sándor mean contra-harmonic mean root-square mean harmonic mean inequalities %U http://xblk.ecnu.edu.cn/CN/abstract/abstract25526.shtml