算術級數 angolul

arithmetic progression [arithmetic progressions]▼(sequence)
noun
[UK: ə.ˈrɪθ.mə.tɪk prə.ˈɡreʃ.n̩] [US: ˌe.ˌrɪθ.ˈme.tɪk prə.ˈɡreʃ.n̩]