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有一些代数问题有明显的几何意义,可先作图。弄清其几何意义,然后利用几何性质求解。这样做往往事半功倍,并可综合、沟通几科知识,一举两得,今略举几例以说明之。例1,已知(x-3)~2+(y+4)~2=25 求
Some algebraic problems have obvious geometric meanings, but they can be mapped first. Find out its geometric meaning and then use the geometric properties to solve it. In doing so, it is often more effective, and it can synthesize and communicate knowledge of a few subjects and serve two purposes. Here are a few examples to illustrate. Example 1, known (x-3)~2+(y+4)~2=25