2021年重庆某外国语学校中考数学二诊试卷

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20CE=1,Z.MF=MBXsinB=2y[3Xsin60°=3,BF=MBXcosB=2«Xcos60஺=«,VZFNM=45°,FMLFN,.FN=MF=3,.BN=BF+FN=<73+3,.NH=BNXsinB=C3+«DXsin60°=⁐jk_2.NG=3^+3.2_ᦑᫀ?33+3.218.C4ᑖDmn3-6ᨴp₝⃉ஹs᪻ஹ᪃᩹├xḄyz{|ᢇ~ᖪpᜧ?ᨬᜧᑭᢇ~ᖪ◤⌕ᦪᙢ.4ᨴ{|ᢇ~ᖪᨴ├~₝⃉ஹs᪻├᪃᩹├₝⃉¡Ḽ£¤ᓣ¦ᨴ{3|§├Lᙠᨴ¨ẠSᨵᡠ¬ᨴs᪻®᪃᩹Ḅ├¯?32,4ᨴs᪻§├®4ᨴ᪃᩹§├¯?5144,±₝⃉ᵫ²├xyzᨴ®ᨴ├ᨵᡠ³´ᨴ₝⃉³´Ḅ®ᨴ$µ{|Ḅ§├¯?1:14,ᑣs᪻ᨴ·¬Ḅ├®ᨴ$µ{|Ḅ§├¯?A.—10ߟூ௃•.•ᨴ₝⃉ஹs᪻├᪃᩹├₝⃉3ºᨴ₝⃉ஹs᪻├?xᑣ᪃᩹├?C1+Dx=&,33»ᨴs᪻®᪃᩹Ḅ├¯?32,ºᨴs᪻├?3y,ᑣᨴ᪃᩹Ḅ├2Dºᨴ₝⃉├?z,V4ᨴs᪻§├®4ᨴ᪃᩹§├¯?5144,•x+3y=¾,¿&ᓄÁy=£,Ã+2y445•••ᨴ₝⃉³´Ḅ®ᨴ$µ{|Ḅ§├¯?114,•,---—=ÄÅ¿&ᓄÁz=2Æ--y,3y+2y+z14153'

21.z=l^x--Lx15353,s᪻ᨴ·¬Ḅ├®ᨴ$µ{|Ḅ§├¯?kÅ=3y+2y+z3X5x-x__________5___________:73Xᔁx+2Xᔁx*x10DDOᦑᫀ?J-.10$ஹ⚪CÈᜧ⚪ᐳ8Ê⚪19Ë25⚪m⚪1ᑖ26⚪8ᑖᐳ78ᑖDÌmÊ⚪pÍÎᑏÐÍ⌕ḄÑÒÓᡈÕᳮ×ØÙLÓÚᑏᙠ⚪ᓱ6ÜjḄÝÞS.19.(10ᑖ)Ò(1)(2a-b)(஺+஻)+(a-b)29ফã-+(ä•-x+i)x2-lx+1ூ௃(1)(2a-b)(a+b)+(a-b)2=2cr+2ab-ab-å+/-2ab+b1=3/-ab9=x-2Å2xT-(x-l)(x+1)(x+l)(x-l)x+1=x-2x+1(x+1)(x-1)2X-1-X2+1=x-2.x+1(x+1)(x-1)W_2+2XX—X~2rx+1(x+1)(x-1)-x(x-2)=æ1x(x-l)__1~2--X-X20.(10ᑖ)᝞5ᙠ@ABC6AB=AC,஺#8cḄ6çèA஺E#C4éêëSæìëAíᑖNBAE.G1$BAFḄᚖëᚖï?GC⌕ðñò5óᑏôõᶇ5V÷D;G2$ᙠG1$ᡠḄ56ðøa#&3ZMGù&.

22E(2)øú.AB=AC஺#BCḄ6,:.ADA.BCZABC=ZACB,9•,ìëAFíᑖNBAE,JNEAF=NBAF,NEAB=ZABC+ZACB,BP/EAF+NBAF=NA8C+NAC8,AZEAF=ZACBf.AF//BC,.AD±AFf.ZADB=ZDAG=90",9BGA.AF,.ZBGA=90°,a#&ADBG?ùû

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26—-|A+m|=-1,,m=1ᡈ-2,22.*./n=l,.x>3⌱?5,0B#ᐭy=11,x-2—-1=Q>,஻=3,31U••m=1,஻=3H?2BIJᦪ
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27u᪻qyḄ1.2~mu᪻ᓟt16ᐗḄyxnᓟt20ᐗḄyᜩmnᙳᐰmnoᑭ1800ᐗ.(1)mu᪻Ḅqyᓟtᐗ(2)5ᨴ1kImnoḄqypqr300ᓟtmu᪻ᜩᓟt16ᐗḄyr8aᓟtqḄ.ᵫmu᪻`᧕¡¢ᜩmno£mu᪻Ḅy¤¥r4¦,ᑮr¨_ᐵoªᒕ20ᓟt¬ᨵo®¯£ᒕ°mu᪻ᑖ±²rmnoᕒR´cnµᢇmu᪻Ḅᑭ·^2660ᐗ஺Ḅ.ூ௃(1)¹mu᪻ḄqyᓟtxᐗᑣxnḄqyᓟt1.2xᐗ(16-x)X100+(20-1.2x)X50=1800,,x=5,mu᪻Ḅqyᓟt5ᐗH(2)ᵫ⚪¼½,16X84+(300-8a-20)X16X(1-«%)-300X5=26608a>1x300,2,஻=25,aḄ25.24.(10ᑖ)ÀÁÂÃᯠᦪÅ᝞n஻ÆÇᔜÁᦪÃ_ḄᦪÉÊ`ᙳ`^0,ËḄÌÃᦪÉÍᓝÃᦪÉÏwÐÁÃᦪÉḄ~ÑÒÓµÁᦪ஻^“Õᦪ”.ÀÁ“Õᦪ”஻?£஻ḄÌÃÍᓝÃᦪÉÀ×,ᑮØᦪ஻Ù/(Ú)=ÂÛ.Ü᝞111153,Ý^1+5=2Þ3,ᡠ153Á“Õᦪ”ÑÒ“=513,ᡠ%(153)=153+513111=6.(1)ᑏᨬXwᨬᜧḄ“Õᦪ”m,àÀáḄF(m)ḄH(2)ãs''Õᦪ"s=100x+10y+z(11WZW9,x,y,zᙳ^᦮ᦪ)êëQ(s)=ìF(s)ÍsḄÁÃᦪÉÏwÁíᐰîïᦪQ(s)ᨬX.Xூ௃(1)¹“Õᦪ=ᐙ(lWaW9,1W6W9,1WCW9a,b,cÊ`ÐḄ᦮ᦪ)ᑣa+h=2c,.,.c=A(a+b),2

28a+hóᏔᦪ-ᨬX4=1,b=3,c=2,ᓽᨬXḄ“Õᦪ”-¢132,.F(-)=F(132)=132+312=4(111ᨬᜧa=9,b=7,c=8,ᓽᨬᜧḄ“Õᦪ”ö=978,.F(m)=F(978)=÷øᳮ=16H111(2)Hs“Õᦪ”s=100x+10y+z,.".x+y—2z,•?(s)=100x+10y+z+100y+10x+z"'ill=110x+110y+2z=220z+2z=2.Ill-111”lீzW4F(s)ÍsḄÁÃᦪÉÏw^2z+z=3z,•F(s)ÍsḄÁÃᦪÉÏwÁíᐰîïᦪ,•••3zíᐰîïᦪH.3z=3ᡈ12,zᙳ^᦮ᦪ.,.2=1ᡈ3,,.TWx

29•'•xᨬᜧ=2Q(s)ýX=90+/=121.5,25WzW9F(s)ÍsḄÁÃᦪÉÏw^2z-10+z=3z-10,,:F(s)ÍsḄÁÃᦪÉÏwÁíᐰîïᦪ•••3z-10íᐰîïᦪH5W3z-10W17,.3z-10=9ᡈ16,ᡈÿ33
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30(,qACuvᙠ$,/>?)wᔲyᙠzW,C,G⚔;Ḅ|Ὺ$%YACG?~yᙠᑏ⌕GḄᡠᨵ;GḄᙶ᪗ᑏᐸ)EḄGILs~yᙠᳮᵫ.ூI௃I(1)n*ᱥ,*2+2\x=0`y=2,.C(0,2),\y=°`-^-2->4X+2=0,XIiX1=-1,X2=3,
.A(-1,0),B(3,0),$,8CḄI᪆Ky=kx+b(#0),;C(0,2),B(3,0)ᐭif2!b=2,Iik*l3k+b=0b=2...$,BCḄI᪆K.x+23(2)-AD//BC,$,8cḄI᪆Ky=[x+2ḄI᪆Ky=EL2;A(-1,0)ᐭi:W><(-l)tm=0,Ii=E2,3.♦.4஺ḄI᪆Ky=J&rx^3"y=-^-x2+^x+2‘X[=-lx?=4ᵫnnIi22:Vy=n10,¡2ll°[^2=N.D(4,3_4$,8ḄI᪆Ky--^7x+2)o\y=0`,4X+2=0,Iix=3,2

31R$,CO2x456;N,ᑣ:N(3,0),BN=3-£=1.5,22L;PM5BC6;M,P(a,E|^242+2)o(a,■ᑖ+/3*'•PM=Va2-»*ya+2-(-~a+2)a2+2a•*-S\=SMBC^S»CM+S4PBM=y-AB'0C+y-PM-|x|+j-PM-1x-x|-pBp=yX4X2+yX(-y2+2a)Xa-tyX(-ja2+2a)X(3-a)a=-a2+3t/+4,Si=S^BNC+S^BND=1"BN-0C+y-BN-1y|D22223=4,.\Si-S2=-/+3஺+4-4=-஺2+3஺=--£²³+9,24\஻=£`S1-52Ḅᨬᜧ]924´`;pḄᙶ᪗µ3,1².224*ᱥ,=_102ᔁ*+2Ḅno4x=L•.•*ᱥ,ᔣf"gjkL;O,ᓽ*ᱥ,ᔣf"g1¹ᓫ»$,/x=2,i
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32.ZHCGi=ZQA'Cf¾N4'QC=NC7/Gi=90°,A'C=CGi•/XA'QC^/\CHG\.QA'=CHHG\=QC,99AC//A'C\;A(m2sC)C(a+1,3a33a3:CH=2-a,AQ=2,HG[=CQ=l,.2-(a+1)=2,Iia--I,.C(0,2),H(2,2),AGi(2,1),(n)\|Ὺ¼%UzNCA'G2=90°,HC=AG2`᝞L;4MA'F/6;¡L;஺MCELAᡝ6;E,Ê(i)ᳮËÌYCAEÍYA'G¡2;A'Ca,ᑖC)C(a+1,3333.G2F=A'E=l,FA'=2-a=2,—0>AA'(0,C)3.F(2,C)3.G?(2,)3(iii)\|Ὺ¼%UzNCGW=90°,CG3=A'G3`᝞L;AMA'QL6;Q,L;஺MC'PJJ6;P,Ê(i)ᳮËÌYCPGsSYGd'Q,;A(a,2)஺(஻+13333.A'Q=G3P=2-a,CP=QGi=1-a,PQ=2,2-஻+l-a=2,Iia=0.5,.C(0.5,Ô)G3¡=2-0.5=1.5,6

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