观察法是:通过对题目的变形和思考利用熟知的知识进行求懈.当做一些题时,用这种方法会使你的思维更加开拓.请看下述题目. 题目1 对一切实数x,恒有f(x+2001)=f(x+2000)+f(x+2002).求证:对一切x∈R,都有f(x+6)=f(x). 解析初看此题,似乎很难证明,但若用 The observation method is: through the distortion and thinking of the subject, use the well-known knowledge to make progress. When doing some questions, using this method will make your thinking more open. Look at the following topics. Topic 1 For all real numbers x, Constant f(x+2001)=f(x+2000)+f(x+2002). Proof: For all x∈R, there is f(x+6)=f(x). , it seems difficult to prove, but if used