年门头沟区初三年级第二次统一练习数学试卷评分参考

1、2013年门头沟区初三年级第二次一致练习数学试卷评分参照32412345678DCBACABD,164910111212123051113184sin45(3)0411184sin45(3)04=32421442=52514=0(6)24(m3)=0.2m=12.3m=12x26x9=0.4x=x=3.512x1=x2=3.3xx2y23y15xyxyx22xyy23xxyxy3y=xyxy(xy)22=3x3yxyxy=3x3y3xyx1y3x.4y3=3x9x=3.5x3x216EFBEABC90BEF90ABC1FEBF90BDAC90EBFACBACBF2AFDABCBEFACBF，4

2、ABCBEFABC，5BCEFAB，BE171A1,my=3xym=31AA1,3.1kA1,3y-1O1xxk3.2y33.x2PP(3,9)P(-1,-3).518xx50.1900012000.3x50 xx=200.4x=200.200.5205D19DDFACFDAB=60oACDABCDAC=BAC=30FEBCACAFD=ACB=90ABDF1131AD622BC=CEtanBEC=4373=4273EFDFDF373tanDEFtanBEC3337ACBC44333tanBACtan30432DEDF2EF23233613477S四边形ABCDSACDSACB1DF1ACBC1

3、1143.AC234342225201ODABOADB=901A=30ABD=60ABD=2BDCBDC=1ABD302OD=OBODBODB=60ODC=ODB+BDC=90CDO22OFADADB=90OFBDBOE=A=303BD=OB=2DEBE1BD12OEOB2BE234OD=OB=2DOC=60DOF=30CDODtan6023DFODtan30233CFCDDF23234353321150E8221a1531435452213ABCDEFGH2223ABCDEFGH85.3323ABCDEFGH161252223247258231ym4x2m7xm6m822m2836m8=0m

4、1=2m2=4m4m=21y1x2x242B(-2,n)y1x2x4n=33B(23)ly2xblB322bb143y1x2xx=2ly=-2x-14y1x2xxC(2,0)4lyx=2D(0,-1)E(2,-5).BBGx=2GyF.BG=4.yCG2BG2x=2RtBGCCB5.CE=5CB=CE.BFEEHyH.GH(0,-5).CFDF(0,3)D(0,-1)OxAFD=DH=4BF=EH=2BFD=EHD=90.DDFBDHE.DB=DE.PB=PEHEPCD.PCD.CDy=kx+a.a1,a1,D(0,-1)C(2,0)12ka0.k.2CDy11.5xP(x1x22x)14x1

5、=1x2x.4x135x235.y15y215.122P(3515)(3515).722241ADOMAD=2OMADOM.221.2BOFFO=BOCF.MBCOBFMOBCF.FC=2OM.3AOB=AOF=COD=90BAOD=FOC.AO=FOCO=DOMAODFOC.DFC=AD.CAD=2OM.4MOBCFMOCF.OA图2MOB=F.AODFOCDAO=F.MOB+AOM=90,FDAO+AOM=90.ADOM.531ADOM.B3DCABEMEEENADN.MEOAOBOCODAOBCOD90CADBBCEDCO45.AEDEBECEAED=90.DN=AN.AD2NE.DONAMBCEMBC.图3ONEM.NEOM.AD2OM.725.1ACykxb.ACG(06)C30b6,k2,13kb0.b6.ACy2x622x=1y=4.A14.AP=CQ=tP14-t.3y=4ty2x6Ex=1t.2ECD2t.2S=1t12t=12CQE2244t=2S1.CQE3EFMDCADFBCMHECH.yEM4tHM42t.G1ttOMCM2.22FCQEHCHCQt.ADRtHM