等差
dengˇ cha¯
Equal difference, Equal steps
等差數列
Arithmetic progression, Arithmetic sequence, A sequence of numbers where the difference between adjacent numbers is constant
dengˇ chaˋ shuˋ lieˋ
等差級數
An arithmetic progression, Arithmetic progression, Arithmetic progressions
dengˇ cha¯ jiˊ shuˋ
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