... (a, b) < S(a, b) = M2(a, b) for all a, b > 0 with a = b.Seiffert [1] proved that inequalitiesA(a, b) < T (a, b) < S(a, b)hold for all a, b > 0 with a = b .Chu et al. [5] found ... convex combination bounds ofSeiffert and geometric means for the arithmetic mean. J. Math. Inequal.5(3), 429–434 (2011)[8] Liu, H, Meng, X-J: The optimal convex combination bounds for theSeiffert’s ... b) + (1 −α)H(a, b) < T(a, b) < βS(a, b) + (1 −β)H(a, b)holds for all a, b > 0 with a = b. For fixed a, b > 0 with a = b, let x ∈ [1/2, 1] andf(x) = S(xa + (1 −x)b, xb + (1 − x)a...