【期中期未考试】湖南省株洲市某校初二（下）期中考试数学试卷与答案及详细解析

《【期中期未考试】湖南省株洲市某校初二（下）期中考试数学试卷与答案及详细解析》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

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21efEফ:RShḼyjᔣl[m|nᓫp,ᑣᡠḄRSḄ᪆Y@y=2%-4+|,ᓽy=2x-y,&y=0x=I&AM(|,0),y=3x+l'47X=)*Grsy=2x8ty=-19,A⊍-19),•••5=ix[|-(-|)]x|-19|=^.AWMFூὃB௃8wxᦪḄzᔠ⚪|}~ᦪ8wxᦪ᪆YHḄ☢Mᙶ᪗TZHᓄ-[mூ᪆௃(1)CḄᙶ᪗EḄᙶ᪗ᑣ4EḄ᪷RHḄ☢MYᓽ!HḄ☢M(2)CDBE+EFGHIBCDᑖᡂ☢MNOḄPQᑖḄRSTCOḄUBFᑮCḄ8}O4E,^Ḅᙶ᪗!ᑭᵨ|}~ᦪᓽ!RSEFḄ᪆Y(3)᪷RSkCDBF(-1,0)+TRSy=3x[\fk=3,FḄᙶ᪗cᐭᓽ!bḄ*ᓽ!RSᳮ᪆Yy=2%-3%8M,NḄᙶ᪗ᑭᵨHḄ☢MYᓽ!^MNFḄ☢M..ூ௃:পᙠy=:,;y=4,ᓽᡭ8|=4,x=5,BḄᙶ᪗@(5,0),;y=o,ᓽ=8|=°&]=2,•••EḄᙶ᪗@(2,0),&0B=5,0E=2.ABḄᙶ᪗@(L0),AE=1,AB=CD=AD=4,"ᔁ$22⚓&'28⚓

22•&'S#$%AECD=+CD),AD=|(4+1)X4=10.(2)CDBE+EFGH4BCDᑖᡂ☢MNOḄPQᑖ,ᑣRSTCDḄUBP,VᨵCP=AE=1,&PḄᙶ᪗@(4,4).$RSḄ᪆Y@y=kx+b,E(2,0),RSIḄ᪆Y@y=2x-4.(3)•••RSᓃCDB?(8|,0)+TRSy=3\$RSᓃḄ᪆Y@]=kx+b,ᑣk=3,EB0)cᐭ0=3x(ߟ|)+b.b=efE(2):RS/hḼyjᔣl[m|nᓫp,ᑣᡠḄRSḄ᪆Y@y=2x—4+1,ᓽy=2x-y,&y=0x=I&M(|,0),y=3x+l47X=——Grsy=y=-19,⊍-19),•••5=ix[|-(-|)]x|-19|=^.ANMFூᫀ௃3(1)VM(l,2),N(4,4),1x2H2x(1+2),4x4=2x(4+4),••BMt@¡BBN@¡B.(2)ᵫ⚪জ&a>0BP(Q,3)@¡B,2(a+3)=3a,Q=6¡B`(Q,3)ᙠRSy=-x+b(b£ᦪ)l,3=—a+b,ᓽb=a+3=9.ঝ&aV02(—Q+3)=-3Q,

23:.a=—6.•BP(a,3)ᙠRSy=-x+blb=—3,zla=6,b=9ᡈa=—6,b=-3.ூὃB௃8wxᦪZ¦lBḄᙶ᪗ᱯBBḄᙶ᪗}¨©ª8wxᦪḄzᔠ⚪ூ᪆௃«⚪¬⌕ὃ®¯8wxᦪZ¦lBḄᙶ᪗ᱯ°HḄ☢MOf±.«⚪¬⌕ὃ®¯8wxᦪZ¦lBḄᙶ᪗ᱯ°Of±.ூ௃পM(l,2),N(4,4),1x22x(1+2),4x4=2x(4+4),••BMt@¡BBN@¡B.(2)ᵫ⚪জ&a>஺BP(a,3)@¡B,2(a+3)=3a,a=6V¡BP(a,3)ᙠRSy=-x+b(b£ᦪ)l,3=—a+b,ᓽb=a+3=9.ঝ&a<02(-a+3)=-3a,:.a=—6.BP(a,3)ᙠRSy=-x+blb=-3,zla=6,b=9ᡈa=-6,b=-3.ூᫀ௃(1)$RSABḄxᦪ⊤/Yy=kx+b,RS4BUyjB4(0,3),UxjBB(-4,0),`µ:஺¶RS4BḄxᦪ⊤/Yy=3x+3.(2)ᵫ(1)RSABḄxᦪ⊤/Yy=3x+3,AB=5.ᵫᢚ¸ḄឋºᨵI஺=4஺=3,$D(m,^m+3),AD=J(—m)2+=3,+m<0,"ᔁ$24⚓&'28⚓

24$F(%y),H@OῪRH᝞Z,8(-4,0)᧕¾¿MFB=^NDF}.MF=DN,BM=FN,19x+4=y-1,X=----512y-0=-g-x,•••m(3)$C(c,0),c<0,ᵫ(2)C஺=CD=|c|.•/AB=5,•••5=^=i-3|c|+i-5|c|,AXBOc=8|.•••c(-|,0).•••BA,B.E⚔BḄHT¿ABCᐰO(BEtTBCÅᔠ)জ&Eᙠ4BḄlG᝞Z(ABC(BAE],1.3)V

25ঝ&EᙠZBḄÆG᝞Z¿ABCBAE,3•••A0,3
,C-|,0
,...BE=AC=*AE=BC=I&33V•E3C&|
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ᡈÇ8ÈḄᡈÇ8ᝅ|Ê.ூὃB௃8wxᦪḄzᔠ⚪|}~ᦪ8wxᦪ᪆YËᢚᣚÇᢚ¸Í⚪ÊᐰOHḄឋºTᑨ}HḄ☢MÏÐᣚzᔠ⚪ூ᪆௃ᨚÒᨚÒᨚÒூ௃1
$RSIBḄxᦪ⊤/Yy=kx+b,RS4BUyjB40,3
,UxjB8—4,0
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RSABḄxᦪ⊤/Yy=3x+3,qAB=5.ᵫᢚ¸Ḅឋºᨵ4஺=4஺=3,"ᔁ$26⚓&'28⚓

26$D(rn,^m+3/.AD=J(8m)2+(-]?n)=3,+m<0,12m=---5126,•D$FÇᓃy
,HBDF@OῪRH᝞Z,8(-4,0)᧕¾(MF85XNDF,.MF=DN,BM=FNஹ(x+4=y-|,(x=5712[y-o=---^(y=g&(3)$C(c,0),c<0,ᵫ(2)C஺=CD=|c|.,?AB=5,•••SA-O=*”|C|+”|C|,C=-|,•••BA,B.E⚔BḄHT¿ABCᐰO(BEtTBCÅᔠ)জ&Eᙠ4BḄlG᝞ZABC*BAE1,᝞ZLABC=LABE.2

27•••,ÇÓ3ঝ&Eᙠ4BḄÆG᝞Z¿ABCBAE,3•V40,3
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