2018年高中数学第2章圆锥曲线与方程2.6.1曲线与方程课件1苏教版选修2_1.ppt

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问题1:曲线方程的含义是什么?,问题2:用方程来研究曲线的性质,这种研究方法的可靠性如何?方程能代表曲线吗?,2.6.1曲线与方程,问题情境,问题3:结合直线、圆、圆锥曲线的方程,对于一般的曲线,你能归纳曲线方程的定义吗?,曲线C上点的坐标(x,y)都是方程f(x,y)=0的解;,建构数学,一般的,如果,且以方程f(x,y)=0的解(x,y)为坐标的点都在曲线C上,那么,方程f(x,y)=0叫做曲线C的方程;,曲线C叫做方程f(x,y)=0的曲线.,数学应用,深化理解,(1),(3),(2),问题:求曲线方程的本质是?要注意什么问题?,课堂小结,同学们,今天你们获得了什么?知识?思想方法?,作业,书64页:1,2,3,5,思考:你能从充要条件的角度来解释曲线与方程的关系吗?,如果曲线C的方程是 f(x,y)=0, 那么点P0(x0 ,y0)在曲线C 上的 充要条件 是f(x0, y0)=0,

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