【教材分析】“鸡兔同笼”是中国古代著名的趣题,最早出现在《孙子算经》中,距今有1500年左右。对于“鸡兔同笼”的问题,解法有很多种,在小学阶段大致可分为两类:一类是用四则运算的方法解决,另一类是用方程的方法解决。就逻辑思考而言,列方程的方法比四则运算的方法要清晰简洁,但计算复杂一些;用四则运算的方法虽然简单, [Textbook analysis] “chicken rabbit with the cage ” is a famous ancient Chinese interesting, first appeared in the “grandchildren”, about 1500 years ago. There are many solutions to the problem of “chicken and rabbit in the same cage”, which can be roughly divided into two categories in the elementary school stage: one is to solve with the method of four operations and the other is to solve it by the method of equation. In terms of logical thinking, the method of column equations than the four methods of operation should be clear and concise, but the calculation is more complex; with four arithmetic method is simple,