逻辑推理问题是数学竞赛中一个重要题型,解答这类问题有助于启迪学生的思维,提高学生的分析、推理能力,它通常给出的条件较多,错综复杂,解答起来十分棘手。但我们如果能选择合适的方法,所求问题便迎刃而解,现举例如下。 1.假设法例1 张大妈问三位青工的年龄,小刘说:“我22岁;比小陈 Logical reasoning is an important question in mathematics competition. Answering this kind of question is helpful to enlighten students’ thinking and improve their ability of analysis and reasoning. It usually gives more conditions, is complicated and complex, and it is very difficult to answer. However, if we can choose the right method, the problems we seek will be easily solved. The following are examples. 1. Assuming that Aunt Zhang asks the ages of three young workers, Xiao Liu said: “I’m 22 years old;