2021年最新人教版八年级数学上册第一单元试题及答案.pdf

八年级数学（上）第一单元自主学习达标检测B 卷（时间 90 分钟满分 100 分）班级学号姓名得分一、填空题（每题2 分，共 32 分）1如果 ABC 和 DEF 全等，DEF 和 GHI 全等，则 ABC 和 GHI _全等，如果 ABC 和 DEF 不全等，DEF 和 GHI 全等，则 ABC 和 GHI _全等（填“一定”或“不一定”或“一定不”）2如图，ABC ADE，B100，BAC30，那么 AED_3 ABC 中，BAC ACB ABC432，且 ABC DEF，则 DEF _4如图，已知 AEBF,E=F，要使 ADE BCF，可添加的条件是_.5 如图，BE，CD 是 ABC 的高，且 BDEC，判定 BCD CBE 的依据是“_”6如图，AB，CD 相交于点O，ADCB，请你补充一个条件，使得 AOD COB你补充的条件是_7如图，ABC 是不等边三角形，DE=BC，以 D，E 为两个顶点作位置不同的三角形，使所作的三角形与ABC 全等，这样的三角形最多可以画出_个8如图 4，AC，BD 相交于点O，ACBD，ABCD，写出图中两对相等的角_9已知 DEF ABC，AB=AC，且ABC 的周长为23cm，BC=4 cm，则 DEF 的边A D E C B A D E C B A D O C B A C F B E D 第 2 题图第 4 题图第 5 题图第 6 题图A D O C B ABCDE第 7 题图第 8 题图精品w o r d 学习资料 可编辑资料-精心整理-欢迎下载-第 1 页，共 8 页中必有一条边等于_10如图，ABC 中，C90，AD 平分 BAC，AB5，CD 2，则 ABD 的面积是 _11如图，直线AEBD，点 C 在 BD 上，若 AE 4，BD8，ABD 的面积为16，则ACE的面积为 _12如图，已知在ABC中，90,AABAC CD平分ACB，DEBC于E，若15cmBC，则DEB的周长为cm13地基在同一水平面上，高度相同的两幢楼上分别住着甲、乙两位同学，有一天，甲对乙说：“从我住的这幢楼的底部到你住的那幢楼的顶部的直线距离，等于从你住的那幢楼的底部到我住的这幢楼的顶部的直线距离”你认为甲的话正确吗？答：_ _14如图，沿AM 折叠，使 D 点落在 BC 上，如果 AD=7cm，DM=5cm，DAM=30，则 AN=_cm，NAM=_.15在ABC 中，C=90，BC=4cm，BAC 的平分线交BC 于 D，且 BDDC=5 3，则 D 到 AB 的距离为 _16在数学活动课上，小明提出这样一个问题：B=C=900，E 是 BC 的中点，DE平分 ADC，CED=350，如图，则 EAB 是多少度？大家一起热烈地讨论交流，小英第一个得出正确答案，是_ _二、解答题（共68 分）A D C B A D C B E BCADE第 10 题图第 11 题图第 12 题图DCBAE图4ABDCMN第 14 题图第 16 题图精品w o r d 学习资料 可编辑资料-精心整理-欢迎下载-第 2 页，共 8 页文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J217（5 分）如图，已知AB 与 CD 相交于 O，A D，COBO，求证：AOC DOB18（5 分）如图，C D，CEDE 求证：BAD ABC19（5 分）如图，D 是ABC 的边 AB 上一点，DF 交 AC 于点 E，DE=FE，FCAB，求证：AD=CF20（5 分）如图，公园有一条“Z”字形道路ABCD，DACBEMFE A B DF C 精品w o r d 学习资料 可编辑资料-精心整理-欢迎下载-第 3 页，共 8 页文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2其中CD，在,E M F处各有一个小石凳，且BECF，为BC的中点，请问三个小石凳是否在一条直线上？说出你推断的理由21（5 分）已知：如图11，在 RtABC 中，C=90，BAD=21 BAC，过点 D 作DEAB，DE 恰好是 ADB 的平分线，求证：CD=21DB22（6 分）如图，给出五个等量关系：ADBCACBDCEDEDCDABCBA请你以其中两个为条件，另三个中的一个为结论，推出一个正确的结论（只需写出一种情况），并加以证明已知：求证：证明：A B C D E 精品w o r d 学习资料 可编辑资料-精心整理-欢迎下载-第 4 页，共 8 页文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J223（5 分）如图，ABC 中，AB=AC，1=2，求证：AD 平分 BAC24（5 分）如图，以等腰直角三角形ABC 的斜边AB 与边面内作等边ABD，连结DC，以 DC 当边作等边 DCE，B、E 在 C、D 的同侧，若AB=2，求 BE 的长25（6 分）阅读下题及证明过程：已知：如图，D 是ABC 中 BC 边上一点，E 是 AD上一点，EB=EC，ABE=ACE，求证：BAE=CAE证明：在 AEB 和AEC 中，EB=EC，ABE=ACE，AE=AE，AEB AEC 第一步C A B D E 精品w o r d 学习资料 可编辑资料-精心整理-欢迎下载-第 5 页，共 8 页文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2 BAE=CAE 第二步问上面证明过程是否正确？若正确，请写出每一步推理的依据；若不正确，请指出错在哪一步，并写出你认为正确的证明过程26（6 分）如图所示，ABC 是等腰直角三角形，ACB90，AD 是 BC 边上的中线，过 C 作 AD 的垂线，交AB 于点 E，交 AD 于点 F，求证：ADC BDE27（7 分）如图16，把 ABC 纸片沿 DE 折叠，当点A 落在四边形BCDE 内部时，（1）写出图中一对全等的三角形，并写出它们的所有对应角；（2）设AED的度数为x，ADE的度数为y，那么 1，2 的度数分别是多少？（用含有x 或 y 的代数式表示）（3）A 与 1+2 之间有一种数量关系始终保持不变，请找出这个规律A B C D E F A D E C B A2 1 精品w o r d 学习资料 可编辑资料-精心整理-欢迎下载-第 6 页，共 8 页文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J228（8 分）如图，以ABC的边 AB、AC 为边分别向外作正方形ABDE 和正方形ACFG，连结EG，（1）试判断ABC与AEG面积之间的关系，并说明理由（2）园林小路，曲径通幽，如图所示，小路由白色的正方形理石和黑色的三角形理石铺成 已知中间的所有正方形的面积之和是a平方米，内圈的所有三角形的面积之和是b平方米，这条小路一共占地多少平方米？A G F C B D E（图）精品w o r d 学习资料 可编辑资料-精心整理-欢迎下载-第 7 页，共 8 页文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6Y6 ZO7S9U9H8J2文档编码:CO10K4V10J6H4 HR3Y8A10E6