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九义教材六年制小学数学课本(人教版)第九册P_(104)第13题:“某农具厂原计划每月生产农具400件。实际9个月的产量就超过全年计划a件。这9个月实际生产农具多少件?”有些学生在解答此题时,错误地列式为:400+a;400(?)+9a或(400+a)·9。其原因是没有认真
Nine textbooks six-year primary school mathematics textbooks (PEP) ninth book P_ (104) 13 questions: “A farm tool factory originally planned to produce 400 farm tools per month.The actual 9-month production exceeded the annual plan a How many pieces of farm implements actually were produced in these 9 months? ”Some students incorrectly set the formula as 400 + a; 400 (?) + 9a or (400 + a) 9 when they answered this question. The reason is not serious