以下用a、b、c分别表示△ABC中角A、B、C的对边.文[1]给出了两个结论:定理1若an,bn,cn(n=1,2,3,4)成等差数列,则B≤60°.定理2若an,bn,cn(n∈Z-)成等差数列,则B≤60°.文[2]指出定理2对n∈R,n0成立,并提出了如下猜想:猜想若an,bn,cn(n≤4,n∈R+)成等差数列,则B≤60°.文[3]利 The following uses a, b, c to represent the opposite sides of angles A, B, and C in △ABC, respectively. [1] gives two conclusions: Theorem 1 if an,bn,cn(n=1,2,3, 4) into a series of equal arithmetic, then B ≤ 60 °. Theorem 2 if an, bn, cn (n ∈ Z-) into arithmetic series, then B ≤ 60 °. [2] pointed out that theorem 2 for n ∈ R, N0 is established, and put forward the following conjecture: guess if an, bn, cn (n ≤ 4, n ∈ R +) into an arithmetic series, then B ≤ 60 °. [3] Lee