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__________________________________________________两条直线的交点坐标（学案）1.已知平面上两条直线，，它们可能的位置关系有哪些？与它们的系数有何关系？2.已知两条直线与相交（1）你能求出它们的交点坐标吗？请先完成下表。几何元素及关系代数表示点直线点在直线上直线与的交点是（2）你能求出下列两条直线的交点坐标吗？，。解：（3）根据平面上两条直线，的交点个数，你能判断出它们的位置关系吗？当与有（）个交点时，两直线平行；当与一个交点时，两直线（）;当两直线有两个以上交点时，它们（）。（4）判断下列直线的位置关系，如果相交，求出交点坐标。1），2），收集于网络，如有侵权请联系管理员删除
__________________________________________________3），1.探究：当变化时，方程表示什么图形？图形有何特点？（1）请分别画出当时的图像，你发现了什么？（2）直线和的交点坐标是什么？（3）根据（1）、（2）你发现什么？（4）如何求出方程表示的直线所经过的定点的坐标？应用：求证：不论m取何值，直线：（m-1）x+（2m-1）y=m-5都过一定点，并求出该点的坐标。2.练习（1）两条直线y=kx+2k+1和x+2y-4=0的交在第四象限，则k的取值范围是（）（2）若两直线（3－a）x+4y=4+3a与2x+（5－a）y=7平行则a的值是（）收集于网络，如有侵权请联系管理员删除
__________________________________________________成都市高2013级高中毕业班第三次诊断性检测英语第二部分阅读理解（共两节，满分40分）ATheWhiteHousehasannouncedplanstoallowvisitorstotakephotosandusesocialmediaduringpublictoursofthebuildingforthefirsttimein40years.Inpreviousyears,thepublicwasbannedfromtakingphotographswithcameraphonesinside1600PennsylvaniaAvenue.However,visitorswillnowhavethechanceoftakingtheperfectselfie（自拍）aslongasit'snorwithaselfiestickattheWhiteHouse,sincethebanhasbeenabolished,FirstLadyMichelleObamamadetheannouncementaboutthechangeofpolicyinavideopostedtoherTwitteraccount."Ifyou'vebeenonaWhiteHousetour,chancesarethatyoumayhaveseenthissign,"shesaidholdingupapieceofpaper."Well,notanymore,"shesaidsmilingasshetorethesignapart,whichhadbeendisplayedduringtourhours。TheWhiteHousesaidinastatement,"GuestsarenowwelcometotakephotosthroughouttheWhiteHousetourrouteandkeepthosememoriesforalifetime."Thelong-standingbanendsonJuly1st,andfromthatpointonguestswillbeabletostartusingcameraphones.Embracingtheincreasingimportanceofsocialmedia,theWhiteHouseisevenencouragingpeoplewhopayavisittothehousetosharetheirexperiencesonTwitterusingthetag"WhiteHouseTour".Officialguidelinesstatethatguestswillbeabletousephonecameraswithalens（镜头）ofthreeinchesorless.ButtheWhiteHousewarnsthatvisitorsmustensurethattheirphotographydoesn'tinterrupttheenjoymentofotherguestsonthetour.Whileitgivesnospecificreasonforthesuddenchange,therearestillafewthingsthatguestsarenotpermittedtodo.Forinstance,videocameras,includingiPadsandcamerasticks,arenotallowedforthemoment.21.WhichofthefollowingwillbeallowedforphotographyintheWhiteHouse?A.Cameraphones.B.Four-inchlenses.C.Selfiesticks.D.iPads.22.Wecanlearnfromthepassagethat_收集于网络，如有侵权请联系管理员删除
__________________________________________________A.thephotobanintheWhiteHouseannoyedvisitorsB.thefirstladyplaysakeyroleinchangingthepolicyC.visitorscantakephotosintheWhiteHouseastheylikeD.thesigncornapartbyMichelleObamaread"NOPHOTOS"23.Wherecanwemostprobablyreadthepassage?A.Inatravelguide,B,Inagovernmentreport.C.Inanewspaper.D.Inaphotographymagazine.BManypeopletodaydonotenjoygroceryshopping,buttheexperiencewehaveisstillmanytimesbetterthanthatofthepast.Gonearethedayswhenconsumerspaidhigherpricesfortheadvantageofapainfullyslowshoppingexperience.Inadditiontolowerprices,supermarketsalsooffershoppersaddedconvenienceandmuchquickerservice.Intheolddays,groceryshoppingwasquiteabittroublesome.Consumer-sizedpackagesdidnotexist,soaclerkhadtomeasureouttheexactamountyouneededforeverythingyoubought.Thissystemcostmuchlaborandthereforewasratherexpensive.收集于网络，如有侵权请联系管理员删除
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