2018_2019学年高中数学第二章函数2.4.1函数的零点情境导学素材新人教B版必修1.doc

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12.4.1 函数的零点【情境导学】 三国志魏书记载:“邓哀王冲字仓舒,少聪察岐嶷,生五六岁,智意所及,有若成人之智.时孙权曾致巨象,太祖(曹操)欲知其斤重,访之群下,咸莫能出其理.冲曰:置象大船之上,而刻其水痕所至,称物以载之,则校可知矣.太祖大悦,即施行焉.”这就是千古传诵、妇孺皆知的曹冲称象的故事.抛开物理学中浮力的原理不谈,显然转化的数学思想起了重要的作用.那么函数的零点与方程的根可以相互转化吗?提示:函数 f(x)的零点就是方程 f(x)=0 的根,也是函数图象与 x 轴交点的横坐标,它们可以相互转化.

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