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1、初三数学选择题专项训练（Third,mathematicsselectivequestion,specialtraining）ThisarticleiscontributedbydjsuperlhdDOCdocumentsmayexperiencepoorbrowsingontheWAPside.ItisrecommendedthatyoufirstselectTXT,ordownloadthesourcefiletothelocalview.Juniorseniorhighschoolentranceexaminationmathematicsmath
2、ematicstips(seniorhighschoolentranceexaminationtips(four)Thereciprocalof1.3is(thereciprocalis(A.)B.Three13C.32D.3Therangeis1(range)ofthevariablexisx(?3A.x>3B.x=3,C.x=32,thefollowingstatementiscorrectmethodiscorrect(3.forthequadraticequationwithoneunknownx?2x?1=0,thefollowingstate
3、mentiscorrect(The2.functiony=A.musthavetwounequalrealnumbers.TherootC.musthavearootof0D.x<3)B.musthavetwoequalrealnumbers,therootD.musthavenorealroot,C,E,A,figure1,BApointonthe4.(Figure1,EisadiagonalsquareABCDonBD(DE=D,EB)isthetotalofcongruenttriangles()isthetotalofcongruenttrian
4、gles(A.1toB.2toC.3toD.4onthefour)graphics,notthecenterofsymmetrythegraphissymmetricfigureis5.(infigureisnotthecenterofsymmetryfourfigure2,(Figure2AThenumberofdata(datamodeforB.7(A.87)BCD11,6.,knownasasetofdatafromsmalltolarge,arrangedfor2,5,6,x,8,11,andthemedianofthissetofdatais7
5、,thenthisgroupC.6D.5Sports.AsshowninFigure4,thepointsintheO*A,PinlineOA.PositionrelationshipwithOPasimpossible.TheradiusofthepositionoftheOandtheAisnotpossible(awayfrom.A..A.1:1...FromB..B.B.1:2.Theintersectionintersectionintersection)D.containing.D.D.1:)containing2picontaining.O
6、PAFigure4C.externalexcision,.C.,externalcut,externalcut,C.1:,PIThecylindricalsideexpansiongraphissquareexpansiongraphissquare,theratiois8.(sidecylinderexpansiongraphisasquare,thenthecylinderdiameterDandcylinderratio(HCalculation:9.calculation:2*(=3)=OO10.comparesize:fillintheblan
7、ks)10.comparesize:Tan60,sin30(fillintheblankswith<<<<<<>>)211.firstsimplify,thencalculate:11.firstsimplify,thencalculate:(x+1),2(x+1)2,wherex=Two212.thevalueoftheknowntwofunctiony=x+4X.2form;(1)writethisfunctionintheformofy=a(x+H)+K,andwritethevaluesofa,h,k;(2)seekthevertexcoordi
8、natesandsymmetricaxisequationsofthisfunc
