微模型 创建数据分析微模型

2022中考压轴:四点共圆模型

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【分析】(2)知识迁移问,只需按照题意套用托勒密定理,再利用等边三角形三边相等,将所得等式两边都除以等边三角形的边长,即可获证 问,借用问结论,及线段的性质“两点之间线段最短”数学容易获解(3)知识应用,在(2)的基础上先画出图形,再求解

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【分析】(1)借助三角形全等,求线段的长度(2)借助模型“对边平行+中点”构造全等三角形将AG转化为GM;(3)主动点M在圆上运动,从动点P也在圆上运动,利用中位线找到P的运动轨迹

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【点睛】本题主要考查等腰三角形与直角三角形、圆的有关概念及性质、三角形的全等和圆的综合运用,解题关键是确定P点的轨迹并且要灵活运用转化思想、推理能力、模型思想和创新意识

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【点睛】考查圆的综合问题,涉及相似三角形的性质与判定,平行四边形的性质与判定,等腰三角形的性质,尺规作图等知识,综合程度较高,需要学生灵活运用所学知识.

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创建数据分析微模型

模型大全模型68:用函数法求最大值模型分析经典例题巩固提升

【概要】本题目考查相似三角形的性质、二次函数的最大值以及矩形性质的应用。注:矩形的对边相等且平行,相似三角形对应的高比等于相似比。题目中等,难度中等。

【解析】取AHy轴,CELAH,证明AHB的CEA,根据相似三角形的性质得到AE=2BH,得到点m的坐标,根据两点间的距离公式用x表示PM,根据二次函数的性质求解。

【概要】本题目考查坐标与图形性质的知识,矩形的判定与性质,同角余角相等,相似三角形的判定与性质,两点间距离的公式,二次函数的性质等。仔细分析图形,利用相似三角形的性质和二次函数的最大值作为辅助线,是解决问题的关键。

【概要】本题主要考查二次函数的图像和性质以及点到直线的距离公式。关键是根据题中给出的点到直线的距离公式来分析解决问题。

【概要】本题主要考察二次函数最大值的求解问题。相似三角形的判定和性质是解决问题的关键。

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