2018年高中数学第一章导数及其应用1.1.3导数的几何意义课件7新人教B版选修2_2.ppt

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1.1.3导数的几何意义,第一章 导数,1.函数的平均变化率是什么?2.函数yf(x)在xx0处导数的定义是什么?,一、知识链接回顾,平面几何中我们怎样判断直线是否是圆的切线?,与圆只有一个公共点的直线就叫做 圆的切线. P,能否将它推广为一般的曲线的切线定义?,二、创设情境,引入新课,我们如何确定切线的方程?由直线方程的点斜式知,已知一点坐标,只需求切线的斜率。那如何求切线的斜率呢?,三、合作探究,分析 利用导数的几何意义求出曲线在点P处切线的斜率,进而求出切线方程,曲线“在”一点处的切线方程问题:,四、课堂典例探,课堂练习:,2.曲线yx3在x00处,是否存在切线?如果存在,求出切线的斜率和切线方程,那么求曲线“过”一点处的切线方程如何处理呢?,“过”点切线问题:,五、课堂小结,1.导数的几何意义。 2.求曲线的切线方程的一般步骤:求出函数在点处的导数得切线方程 注:点是曲线上的点。 3.分清“在”点与“过” 点切线的区别 。,六、课后作业,

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