Evaluation Only. Created with Aspose.Words. Copyright 2003-2022 Aspose Pty Ltd.中考数学复习题(10.05.16)例:如图四边形ABDC内接于⊙ODB=BC已知AD=6∠BAC=60°求:四边形ABDC的面积解:解:作DE⊥AB于点EDF⊥AC交AC的延长线于点F∵DB=DC∴∴∠BAD=∠CAD∴DE=DF∵∠BED=
Evaluation Only. Created with Aspose.Words. Copyright 2003-2022 Aspose Pty Ltd.中考复习题(10.05.12)例:如图△ABC是边长为2的等边三角形点A在x轴的正半轴上移动点B在y轴的正半轴上移动在移动过程中求OC的最大值解:取AB的中点为D连接CDOD∵△ABC是等边三角形易得CD=∵△OAB是直角三角形∴OD=AB
Evaluation Only. Created with Aspose.Words. Copyright 2003-2022 Aspose Pty Ltd.中考数学复习题(10.05.13)例:如图∠AOB=45°C是∠AOB内部一点OC=6在OA上找一点P在OB上找一点Q使△CPQ的周长最小并求出这个最少的周长是多少.解:1.作点C关于OA的对称点C2.作点C关于OB的对称点C3.连接CC交O
Evaluation Only. Created with Aspose.Words. Copyright 2003-2022 Aspose Pty Ltd.中考数学复习题(10.05.18)例:如图四边形ABCD是正方形M为AB上的一点BF平分∠CBGE是BF上一点若DM⊥ME求证:DMME 证明:在AD上截取AG=AM连接MG∵四边形ABCD是正方形∴∠ADM∠AMD=90°AD=AB∵∠DM
Evaluation Only. Created with Aspose.Words. Copyright 2003-2022 Aspose Pty Ltd.中考数学复习题(10.05.19)例:如图四边形ABCD是平行四边形E为BC边的中点DEAC相交于点F若△CEF的面积为6则四边形ABEF的面积为 .解:∵四边形ABCD是平行四边形∴AD=BC∵E是BC的中点AD∥CE∴CF∶AF=
中考数学复习题()例:如图△ABC中∠C=90°AC=4BC=3点O在AB上⊙O与BC相切于点C与AB相切于点D求⊙O的半径解:连接OCODOE设⊙O的半径为R∵AD与⊙O相切于点DBC与⊙O相切于点E∴OD⊥ACOE⊥BC∵AC=4BC=3∴△AOC的面积=△BOC的面积=∴△ABC的面积=∵△ABC的面积=∴∴即⊙O的半径为相关练习题如图⊙O是△ABC的内切圆AB43B5求⊙O的半径2.如图△
Evaluation Only. Created with Aspose.Words. Copyright 2003-2022 Aspose Pty Ltd.中考数学复习题10.05.22例:已知求代数式的值.解:∵∴所以相关练习题1.直线y3xm2与直线y4x-2m-7的交点不可能在第 象限2.已知方程axbx-40的两个根的平方和为m两根的和为n则代数式ambn-5的值为 .3.
Evaluation Only. Created with Aspose.Words. Copyright 2003-2022 Aspose Pty Ltd.中考数学复习题10.05.20例:如图点BCE在同一直线上△ABC△CDE都是等边三角形连接AEBD求证:BDAE证明:∵△ABC△CDE都是等边三角形∴∠ACB∠DCE60°ACBCCEAD∴∠ACD∠ACB∠ACD∠DCE∴∠BCD∠AC
Evaluation Only. Created with Aspose.Words. Copyright 2003-2022 Aspose Pty Ltd.中考数学复习题(10.05.21)例:一条抛物线的顶点坐标为(23)且抛物线与x轴的两个交点的距离为6求这条抛物线的解析式.解:∵抛物线的顶点为(23)∴抛物线的对称轴是直线x=2∵抛物线与x轴的两个交点的距离为6∴抛物线经过点(50)设抛物
中考数学复习题()例:半径为1的⊙O中弦AB=AC=求∠BAC的度数解:如图分两种情况(1)如图1当点O在∠BAC内部时连接OAOBOC ∵OA=OC=1AC=∴∠AOC=90°∴∠OAC=45° 图1∵AB=OA=OC=1
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