(遵义专版)2019中考数学高分二轮复习第二部分热点专题解读专题八动点型几何探究问题题型4动点与圆的相关计算课件.ppt

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热点专题解读,第二部分,专题八 动点型几何探究问题,题型四 动点与圆的相关计算,常考题型 精讲,2,(1)若点E在线段CA的延长线上,设BPx,AEy,求y关于x的函数关系式,并写出x的取值范围; 【解答】 如答图1,过点A作AFBC于点F,过点P作PHAB于点H. BAC120,ABAC6, BC30. PBPD, PDBB30. ADE30, DAECPE60,,3,答图1,4, 解题步骤 (1)第一步:要得出y与x的函数关系式,即要列出含有y与x的方程,根据等腰三角形的性质得出PC,CE,列方程求解即可; 第二步:x的取值范围可通过解含有x的不等式求得,由题可得BD2BH,求解即可得出结论,5,6,7,答图2,8,9, 解题步骤 要求当SAPESABC时BP的长,分两种情况: 第一种:当D点在线段BA上时,求出SABC和SAPE,列等式求解; 第二种:当D点在线段BA的延长线上时,求出SABC和SAPE,列等式求解,10,

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