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1、精品初中试卷平谷区2009~2010学年度第二学期初三第一次统一练习数学试卷答案2010.4一、选择题(本题共8个小题,每小题4分,共32分)题号12345678答案ABBDBCAC二、填空题(本题共16分,每小题4分)题号9101112答案304(2分)(2分)三、解答题(本题共25分,每小题5分)13.计算:.解:原式4分5分14.解分式方程:解:………………………………………………………………………2分……………………………………………………………………………3分……………………………………………………………………………………4分
2、 经检验是原方程的解. 所以原方程的解是.……………………………………………………………5分15.证明:∵四边形ABCD是平行四边形,∴AB=CD,∠B=∠D.…………………………………2分在△ABE与△CDF中,∴△ABE≌△CDF.……………………………………………………………………………4分 ∴AE=CF.………………………………………………………………………………………5分 otherstaffoftheCentre.Duringthewar,ZhuwastransferredbacktoJiangxi,andDirecto
3、rofthenewOfficeinJingdezhen,JiangxiCommitteeSecretary.Startingin1939servedasrecorderoftheWestNorthOrganization,SecretaryoftheSpecialCommitteeAfterthevictoryofthelongMarch,hehasbeentheNorthwestOfficeoftheFederationofStateenterprisesMinister,ShenmufuguSARmissions,Directoro
4、fNingxiaCountypartyCommitteeSecretaryandrecorderoftheCountypartyCommitteeSecretary,Ministersand精品初中试卷16.已知,求的值.解:…………………………………………………………2分………………………………………………………………3分由得……………………………………………………4分所以,原式…………………………………………………………5分OOP(第17题)17.解:(1)∵在直线上,∴当时,.…1分(2)解是…………………3分(3)直线也经过点∵
5、点在直线上,∴.……………………4分把代入,得.∴直线也经过点.…………………………………………………5分四、解答题(本题共10分,每小题5分)18.解:连结OC,OD,过点O作OE⊥CD于点E.……………………………………1分∵OE⊥CD,∴CE=DE=5,∴OE==5,……………………………………………………2分OEBACD∵∠OED=90°,DE=,∴∠DOE=30°,∠DOC=60°.∴(cm2)…………3分S△OCD=·OE·CD=25(cm2)……………………………………………………4分∴S阴影=S扇形-S△OCD=(π-2
6、5)cm2otherstaffoftheCentre.Duringthewar,ZhuwastransferredbacktoJiangxi,andDirectorofthenewOfficeinJingdezhen,JiangxiCommitteeSecretary.Startingin1939servedasrecorderoftheWestNorthOrganization,SecretaryoftheSpecialCommitteeAfterthevictoryofthelongMarch,hehasbeentheNorthwe
7、stOfficeoftheFederationofStateenterprisesMinister,ShenmufuguSARmissions,DirectorofNingxiaCountypartyCommitteeSecretaryandrecorderoftheCountypartyCommitteeSecretary,Ministersand精品初中试卷∴阴影部分的面积为(π-25)cm2.……………………………………………………5分说明:不答不扣分.COBADMEN19.(1)证明:连接OD.∵OA=OD,.∵AD平分∠CAM
8、,,.∴DO∥MN.,∴DE⊥OD.………………………………………………………………………………1分∵D在⊙O上,是⊙O的切线.……………………………………………………………………2分(2)解:,,,.……