映射法是通过找到某种对应关系将原问题转化为更易解决的新问题(即映射),求得新问题的解答后再通过逆映射求得原问题的解答(即反演).[1]映射法是化归的重要手段,使用映射法的目的是期望更高效地解决问题.本文通过对比试题的两种解法谈谈映射法如何解题,体验从映射法的视角解题的妙处. The mapping method transforms the original problem into a new problem that is easier to solve (ie, mapping) by finding a corresponding relationship, obtains the solution of the new problem, and then obtains the solution of the original problem (ie inversion) by inverse mapping. [1] The mapping method is an important means to return to normal and the purpose of using the mapping method is to expect to solve the problem more efficiently.Through the comparison of two solutions of the test questions, we can talk about how to solve the problem of mapping method and experience the beauty of solving problems from the perspective of mapping method.