fhnocAAA新人教版七年级下册数学竞赛试卷及答案

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54D3E21CBA103301ABCD().A180BCDBBBACD2134C43D5B.2P6-2xx-5?xA3x5Bx5Cx3D-3x53A3-54,3BB()A(1,-8)B(1,-2)C(-7,-1)D(0,-1)4100491711131327()A2B3C4D55A.2aB.aa2C.aD.aa6ab+1b+1B.a2b2C.3a-43b-44-3b7l1l2l3l41=44A46B44C36D228ayxayx13313yx0aAa1Ba1Ca1Da1950cm10A400cm2B500cm2C600cm2D4000cm210.aAa36Ba36Ca36Da36(9,3,27)1116_______________12[x][]=3[]=1[1]=13Axx3y4A________14AOBOC30__________()15251411027416ABCDBAE=120oDCE=30oAEC=1772118P(03)OABC.1P12P2nPn.P2014.19902014(43)20.a3a21.1AB1030AB21CDACBC1CDABDC2yPP32QBDQCQOQBDBD22.PxyxyPSNLABCS=1N=0L=41DEFGSNL2S=N+aL+babN=82L=38S23xy=2x1y0x+yxy=2x=y+2x1y+21y1y01y01x2+1+1y+x0+2x+y0x+y21xy=3x2y1x+y2y1x1xy=ax+ya24.AB10A1B2400A2B13501AB2AB60100AB120010680103301B2B3D4A5B6D7A8C9A10.xa1x37a137a36C(9,3,27)112122134,3-4,314_;1690;1712318(5,0);19.320.x3xa4a3a3x3a3xa621.1AB21CDAB1030CD0242AB4CO2SABCDABCO42842P0404P0ySPABAB|y|4|y|2|y|1SABCD82|y|8y4P0404839QQE//CDDCQ1AB//CDQE//AB2BOQDCQBOQ12CQO12DCQBOQCQO12221S=3N=1L=63ABCDEFGSNL6S=N+aL1N=82L=38S=82+1/2381=1008231xy=3x=y+3x2y+32y1y11y12x4+1+2y+x1+4x+y1x+y532xy=ax=y+ax1y+a1ya1y11ya1a+1x1+1+a+1y+xa1+1x+ya+2x+ya28241AxByA100B15032AaB10a6a8a=67810a=4326A6B41006+1504=1200A7B31007+1503=1150A8B21008+1502=1100A8B211009

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