短語詞組短語arithmetic operators progression 算子級數法arithmetic c progression 等差數列differential arithmetic operators progression method 微分算子級數法n order arithmetic progression n 階等差數列high arithmetic progression 高階等差級數sum of arithmetic progression 算術極數的和summation of arithmetic progression [數]算術級數求和arithmetic -geometric progression 算術幾何數列 返回 arithmetic progression