笔者在文[1]中证明了: 定理1 若不相等的三数α、β、γ成等差数列,且x-y/α-β=y-z/α-β。则x、y、z也成等差数列。从而对“已知三数成等差数列,求证另外三数也成等差数列”问题,给出了一种新的证明方法。 The author proves in [1]: Theorem 1 If the unequal three numbers α, β, γ are equal arithmetic series, and x-y/α-β = y-z/α-β. Then, x, y, and z become equal arithmetic series. Therefore, a new method of proof is given for the problem that “the known three-digits are a series of arithmetic differences and the other three numbers are also proved to be a series of arithmetic differences”.