华东师大版八年级数学下册期中数学试卷含答案解析

11y1x2x()Ax0Bx2Cx2Dx2270/xy()A70BxCyD3y2x6()ABCD4a21a22a1a1a()A.12B.aa1C.a1aD.a1a25?ABCDC108BEABCABE()A18B36C72D108576xmx2x12x3m()Am1Bm2Cm3Dm0m37P?ABCDADPABPCDPBCS1S2S3()AS3S1S2B2S3S1S2CS3S1S2DS3S1S2820km/h400km100kmxkm/h()A.400x400100x20B.400x400100x20C.400x400100x20D.400x400100x209k1(k1)0y(k1)x1k()21050025100/y()t()()Ay()t()y8t25B21C4D6110.0000156____________12x________x22x50.13y2xyx________(14?ABCDBEABACE1202________14161715y2x13____________16ABCDADBCB70C40DEABBCE.AD5cmBC12cmCD________cm.17RtAOBAyxmymxSAOB2m________18?ABCD40cmACBDOAOBBOC4cmAB________cmBC________cm.193(1)20160|2|32141(2)1x33x.20.2xx12x4x21x2x22x1x21?ABCDOACBDOEADEOFBCF.OEOF.22AB76AB2610.5(1)1(2)AB39423ykxykxbA(14)B(4n)(1)(2)OAB(3)x24AB2h0.5hy(km)x(h)(1)ma(2)y(km)x(h)x(3)50km?51D2.A3.B4.B5.B6C7.A8.A9.A10Cy()t()yktb.(025)(29)b252kb9k8b25.y8t25A30921()B(259)8()303344()C5001005()5840()25212521406()DC.111.5610512.213.14.11015y2x216.717.418128?ABCD40cmBCAB20cm.AOBBOC4cmABBC4cmAB12cmBC8cm.19(1)12342.(2)x(x3)x3(x3)x92.x92x(x3)x9220.2xx12x2x1x1x12x22xx12x2x12x2x2x12x1.x012(x1)(x1)x2xx2x02.x02.21ABCDOAOCADBCEAOFCO.OEADOFBCAEOCFO90AEOCFOEAOFCOAEOCFOOAOC6AEOCFOOEOF.22(1)1x76x0.526xx0.26.x0.2610.26(2)ABy0.26y260.26y(0.260.50)39y74.7423(1)A(14)ykxk14y4x.B(4n)y4xn441B(41)A(14)B(41)ykxbkb44kb1k1b3.yx3.(2)y0x30x3yx3x(30)A(14)B(41)Ax4Bx1SOAB123(41)152.(3)x14x0.24(1)m1.50.51v120(3.50.5)40(km/h)a40.(2)0x1y40x1x1.5y40x1.5ykxb(1.540)(3.5120)1.5kb403.5kb120k40b20.y40x20.y40x0x1401x1.540x20x1.5.(3)yaxb(20)(3.5120)2ab03.5ab120a80b160y80x160.50kmyy5040x20(80x160)50x2.252.2520.25(h)yy5080x160(40x20)50x4.754.7522.75(h)0.25h2.75h50km.