- [數(shù)] 算術級數(shù)求和
- arithmetic progression: 等差級數(shù)；算術級數(shù); 等差列; 等差數(shù)列（等差級數(shù)）; 算術級數(shù)；等差級數(shù)
- summation of geometric progression: 幾何級數(shù)求和
- arithmetic progression (sequence): 等差數(shù)列
- arithmetic progression(sequence): 等差數(shù)列
- sum of arithmetic progression: 算術級數(shù)的和
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