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a.rith.met.ic.alHAr7IW5met7I7k[l, $.er7IW5met-adja.rith.me.tic H0CrYIP9metYIk, $0erYIP9met-算术的My son is very good at solving arithmetical problems.我儿子很善于解算术题。An arithmetical/arithmetic progression is a SEQUENCE (=ordered series) of numbers which increase or decrease by the same amount, such as 3, 6, 9 …, or 9, 6, 3.算术级数
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