“九头鸟长有九个头和一条尾巴,九尾鸟长有一个头和九条尾巴,现共有52个头和68条尾巴,九头鸟和九尾鸟分别有多少只?”是人教版六年级(上册)数学广角“鸡兔同笼”中的一道思考题。不少教师认为此题无法用“鸡兔同笼”的相关知识解决,难度太大,超过了学生的认知水平,从而抱怨教材不该编入此题。 “The nine-headed bird has nine heads and one tail. The nine-headed bird has one head and nine tails. There are now 52 heads and 68 tails. How many are the nine-headed bird and the nine-headed bird?” Sixth grade (volume) Mathematics wide angle “chicken rabbit with cage ” in a question of thought. Many teachers think this question can not be solved with the related knowledge of “chicken and rabbit with cage”. It is too difficult to surpass the level of students’ cognition and thus complains that teaching materials should not be included in this question.