代数中 ,对于一个方程f(x) =g(x)的解的个数问题可用两条曲线 y1 =f(x)与 y2= g(x)的交点个数来判断 .我们不妨将此法称之为“一分为二” ,它是我们处理此类问题的一个很好的方法 .但如何使用这种方法 ,以及在使用过程中应注意哪些问题 ,却经常困扰着同学们 .在此笔者愿跟大家 In algebra, the number of solutions to an equation f(x) = g(x) can be judged by the number of intersections of the two curves y1 = f(x) and y2 = g(x). We may wish to use this method. Call it “one divide into two”, it is a good way for us to deal with this kind of problem. But how to use this method, and what problems should be paid attention to in the course of use, but often plagued the students. In this I would like to follow everyone