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math
- 本程序是1000以内的随机加减法程序，适合偷懒的家长给小学生使用。每次出10题。已经经几个家长使用非常，并得到好评！-This procedure is less than 1000 random addition and subtraction procedures for lazy parents give primary school children. Every time the 10 questions. Has been used by several parents, and p