日常生活中处处存在着数学 ,如与年龄有关的数学问题 ,这些问题生动有趣 ,但往往与和、差、倍数等关系结合在一起 ,比较复杂 .正确处理这类问题 ,常要抓住的关键是“年龄差”不变这个基本关系 .下面举例说明 . Everyday life there are mathematics, such as age-related mathematics problems, these issues are lively and interesting, but often combined with the relationship between the sum, difference, multiples, etc., are more complex. Correct handling of such issues, often the key to grasp This is the basic relationship of “age difference”. The following example illustrates.