19版八年级期中考试-数学卷

20192019120100220125xxA.5xB.5xC.5xD.5x2x25yxa211xA1B.2C.3D.433yxA.B.C.D.40.000073mA.m4103.7B.m5103.7C.m6103.7D.m510735baabab()A.abB.abC.22abD.16ABCS1S2S3S1=25S3=9S2()A.9B.12C.16D.181617181920212267skmthvkm/h8)(yxyxxxy2A.2B.2C.D.39ABCDSCABCDSCA.SSCCB.S=S;C=CC.S=S;CCD.S=S;CC10ABCAB=15AC=13,BCAD=12BCA.14B.4C.144D.56531511xmy201320131m12__13021(1)()314y=x4A-2y1B-1y2C1y3y1y2y3___________________153ykx(k0)xy4Ax1y1Bx2y22x1y27x2y1___________thv(km/h)Ot(h)v(km/h)Ot(h)v(km/h)Ot(h)v(km/h)OABCD15ABCBDADC9(65)161426101yxyx4)2(22222()5525xxxxxxx17.71233xxx187AD=4mCD=3mD=900AB=13mBC=12m1982000280014209y=kx+by=mxA21B-1n12x20211011y=2x+4xyABAB221M34N-2-132DxDNDMD12-2-1-2-1-2-12214Aa,b6yxx011AADyDPxAPAPD2Aa,bRtABC2BCBB10abBC32RtABCAa,bBCa,bCOC2OB212