对一道习题结论的思考与拓展

Thinking and Expansion to a Maths Problem

通过对一道习题的解答,借助图象,给结论一个直观易记的几何解释,并对这一结论进行了拓展。

By means of an example and with the help of graphics,this paper mabes it easy for the conclusion to be rememberep geometrically, and finally the conclusior is further devoloped.