中考數(shù)學(xué)知識(shí)點(diǎn)過關(guān)培優(yōu) 易錯(cuò) 難題訓(xùn)練∶圓的綜合及答案

一、圓的綜合真題與模擬題分類匯編（難題易錯(cuò)題）3，1M交xCyM3O3，（OM于y．2;34．M作于T連∠∠△≌△1△∠M作于T連，∵O1∴3，2∴124；∠∠，∵，∴∠∠△∵∠∠，∴∠∠∠，△△AFHAEHAHFAHEAHAH∵，∴△≌△∴；∠∠，∠∠，∵O4，∴，連，∵∠，∴x∴∥，∵∠，∴，∵，∴∥，∴∴．2OO∠O．OO5O241∵∠∴EADOAD∵OAOD，ODAOAD∴ODAEAD∴∥∵∴∵點(diǎn)∴DO∴O）DFADEA，AFAE8＝FAD＝AD，＝DE，∵∵∴△≌△∴，OAOD5∴OF3AFAE8DF＝ODOF4∴223,．∠°∠PPP271△△是∠．∠PPP∠7，71，∵,，∴．∵．∴△∠．7244OC是B)∠I∠的ABO．．與O2F是CEFIAB2323）91∠∠∠∠∠△∠∠ID1F是弧?△∠∠I11.1∵點(diǎn)I∠∴∠∴∠∠∴弧弧∴∵∠∠∠∴∠∵弧弧∴∠∠∵∴△∴∠∠C∵I△∴∠∴∠∠∵∠∠∠∠∠∠∴∠∠∴∵∴ID1∵∠弧∴∠∠∵2∴∠∴∠∵點(diǎn)F是弧△∴∠∴弧，∴弧∴∠∠∴∠∠∠∴∠∠∠11∴∠∠D11∴∴弧II12.5ODO交O.2）∠∥∠＝、．∵．∴∠∠．∵，∴∠∠．∴∠∠．∴∥．∴∠∠，∵∠，∴∠即，∵OC∴O∵，∴∠∠∠，∴∥，∵∠∠，∴∥，∴∴，∵∠∠，∴，∴，∴△在＝，∴S＝＝6在OABC為O.C作OCABABPDACOD交ACDCAB的CABP.∠∠∠A∠的D，∵，∴∠∠，∴∠，∵O∴∠，∴∠；∵D∴，∵∠，∴∠，∴∠，∵∠∠∠，∴∠．7OA△C為x△交yE△≌△C線C∥F23x23；yC(4,0)∥F.∠∠∠∠∠△≌△2∠∠△∠∠點(diǎn)EA和E∥∥與重F為與F為A為ACF與與與.∵△△∴∠∠，∴∠∠∠∠，∠∠，△△OBABOBCABDBCBD,∴△≌△C∵△≌△，∴∠∠，∵∠，∴∠，∴∠，在△則3，，∴點(diǎn)E3E和Akb02，23b3k，23b∴323.yx(4,0)C∥F∵∠∠∥∥，則與∴點(diǎn)F為與又F為∴A為，∴當(dāng)C40∥，F(xiàn)∵△F為∴∥，∴，∴F.81OD作∠．⑴若2；⑵與⑶Gx與y.⑴222⑵⑶=2x∠△2D作.證或，證1證；2OD△≌△得22xCD2xx)=22x得(2x.∵∠，∴∠∵∴△∵，∴∴,2，2∴222.⑵D作.∵,∴∠∠，∴，∵△∴，∴，∴△≌△∴∵∠∴∠∴∠∵∠，∴∠∴∠∴∠∠1∴2∴CD2x∠∠得OD∴22x∵∴∠∠，2∠∠∴△≌△∴=22x∵∴(2xx)22x2xx)∴=2x=.9O，D作O的33）231O∠得SS．∵△∴∠∠．∵，∴△∴∠，∵，∴∠∠，∴∠∠∠，∴O∵△∴．∴．∵∠，∴．∴，．∴，∴．∴S=，∴S==，∴SSOED=﹣．O于A∠∠D作的O．OBD2131∠∠∠∠∥∠11∵，∴∠∠，∵∠∠，∴∠∠，∴∥，∵，∴，∴O∵∴∠∠∠0∴∠∠∠oO