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利用因式分解即可得到xy±x±y+1=(x±1)(y±1).这两个貌似平凡的命题却有着非凡的功效.据此解决一些数学问题,常能出奇制胜,化繁为简,化难为易.下面举例说明.
Using factorization, you can get xy±x±y+1=(x±1)(y±1). These two seemingly ordinary propositions have extraordinary effects. Solving some mathematical problems can often lead to surprises. To simplify the complex, the difficulty is easy. Here is an example.