《函数与方程、不等式之间的关系》函数PPT课件(第2课时)-人教高中数学B版必修一

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并能用函数与方程思想分析问题、 提升数学抽象的学科素养.
解决问题.(重点、难点)
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ቤተ መጻሕፍቲ ባይዱ
4
1.函数零点的存在性定理 如果函数 y=f(x)在区间[a,b]上的图像是连续不断的,并且 f(a)f(b) <0 (即在区间两个端点处的函数值异号),则函数 y=f(x)在区间[a,b] 中至少有一个零点,即∃x0∈[a,b],f(x0)=0.
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1.掌握函数零点的存在性定理,并
2
核心素养
会判断函数零点的个数. (重点) 1.通过存在性定理的学习,培养逻
2.了解二分法是求方程近似解的 辑推理的素养.
常用方法,掌握二分法是求函数零 2.通过二分法的学习,提升数据
点近似解的步骤.(难点)
分析,数学建模的学科素养.
3.理解函数与方程之间的联系, 3.理解函数与方程之间的联系,
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自主预习
3
探新知
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第三章函数
3.2函数与方程、不等式之间的关系 第2课时零点的存在性及其近似值的求法


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