贵州省毕节市2021-2022学年中考数学模拟试题（三模）（解析版）合集

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10A.OB.1C.-1D.1ØTூUᫀ௃BூX᪆௃ூvX௃Õ2Ú(X+D(x-1),z6-m(x+1)=(x+1)(x-1),ᵫᨬÝÞᑖß(x+1)(X-1)=0,`&×᪷`ax=lᡈT.x=lm=3,x=-1zᑮ6=0,Ë=`aḄᡠl×᪷âax=l.ᦑ⌱B.10.%&*ᦪMX,,X2,X”x”X5,X6Ḅᙳᦪ2,3,ᑣåᦪM3x,-2,3x2-2,3x3-2,3x,-2,3•2,3x-2ḄᙳᦪØᑖç()6A.2,3B.2,9C.4,25D.4,27ூUᫀ௃DூX᪆௃ூvX௃X:ᵫ⚪&zMX|+X2+X3+X4+X5+X6=2X6=I2,5|=-[3-2)2+(X2-2)2+(X3-2)62+(X4-2)2+(X5-2)2+(X6-2)2](X|2+X22+X32+X42+X52+A-62)Z(X1+X2+X3+X4+X5+-V6)+4X6]=3,[■(Xl2+X22+X32+X42+X52+X62)=42.åᦪḄᙳᦪ=[3X1-2+3x2-2+3X3-2+3X4-2+3X5-2+3x6-2]=—[3(X]+X2+X3+X4+X5+X6)66-2X5]=-[3X12-12]=-X24=4,66åᦪḄ=[(3xi-2-4)2+(3x2-2-4)2+(3ñ-2-4)2+(3ò-2-4)2+(3x56-2-4)2+(3x6-2-4)2]=—[9(Xi2+X22X32+X42'X52*X62)-36(xi+x2'X3*X4*X5'X6)+36X6]=_L[9X42-66—I36X12+216]-X162=27.ᦑ⌱D.611⚓/:27⚓

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12•.•ZD=30°VBDt}•.•ZBAD=90°ABD=2AB=8.ᦑ⌱C.13.᝞wᙠRtAABCZBAC=90°,DஹEஹFᑖtBCஹAB,ACḄ,ூ$ᫀ௃Bூ'᪆௃ூᑖ᪆௃᪷ḄᳮBC=2EF=4,ᑭᵨḄ~zḄᓽ;-ADḄ.ூ)'௃'+.EஹFᑖtABஹACḄ♦.•BC=2EF=4,.ᙠRtAABCZBAC=90°,DNBCḄ/.AD=yBC=2,ᦑ⌱Bூf௃B⚪ὃjkḄᳮmḄḄឋᐵst᪷ḄBC=2EF=4.14.᝞w5Z\ABC8Aᑮ/XADEḄᙢDᑮABḄᚖ¢ᑖூ$ᫀ௃Cூ'᪆௃ூ)'௃ᑖ᪆+ᐜ£y8D,᪷Dᑮ48Ḅᚖ¢ᑖ஻᪷Ḅឋ4?᳘¦§¨t~᪷~ḄឋZBAD=600,ᓽ;13⚓/27⚓

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14)':£y8஺.஻ᑮ48Ḅᚖ¢ᑖ••ADBD"AD=AB,:/ᨴ᝞t~:.ZBAD=60°,..Ḅ©ᦪN60°.ᦑ⌱C.f+g⚪ὃjkḄឋ+¬ᑮḄ®¯°~R¬/ᡠ£Ḅᜳ~zR²ஹḄwᐰ~.ᜐᳮg⚪Ḅᐵstᑨµ448DN~.15.᝞wᙠ~a/igcºtḄ஺ᙠẖ'£y½ᙠḄ¾¿À~Á⊈½E,£yÄÅZUEFᕜᨬÉÊḄᜧÉt̽A.30°B,45°C.60°D.90°ூ$ᫀ௃Dூ'᪆௃ூᑖ᪆௃✌ᐜÎÏEᙠÐCEÑÒÌᓃ4CE=30஺½ᵫz᝞NÕᡠÖÅ45■Ø■ᨬÉÁÙEFḄᕜᨬÉÀXᐵzCEḄ¬Úᩞ£yFM3CEzBḄÕᨬÉ᪷~Ḅᑨmឋᓽ;-ZGFḄᜧÉ.ூ)'௃'+..Á᝞C,ZU0EÝt~AB-AC.AD=AE,ZBAC=ZDAE='ABC=6Q°.4■ZBAD=ZG4E,15⚓/27⚓

15:.ZABD=ZACEf•:AF=CF,•.Z4BAZCBD=ZACE=3஺஺..EᙠÐCEÑÒ(£4CE=30o),ÀAᐵzCEḄ¬ÚM£yFM<Þz£,BḄÕᨬÉ,%:CA=CMZJCM=60°,ft~•:AF=CFfFMLACf•.•ZCFE,=90otᦑ⌱D.ூf௃g⚪ὃj2¬Úᨬயᡂoஹ~Ḅឋmᑨᐰ~Ḅᑨmឋ~áâ'⚪ḄᐵstÎÏEᙠÐCEÑÒ(ᓃÙᙍ=30஺)g⚪ä©åæᜧçzὃ⌱⌱Ḅè2⚪.éêë⚪(ᐳ5É⚪íᑖ25ᑖîÉ⚪5ᑖ)16.ᑖ'ïC(xy-1)2-(x+y-2xy)(2-x-y)=.ூ$ᫀð(y-l)2(x-l)2.ூ'᪆௃ூ)'௃'+=x+\=>%xy=b,ᑣ(ñT)2-(x+y-2xy)(2-x-*)=(ó-1)2-(a-2b)Q-0=b2-2b+\+/-2a-2ab+4b=(a2-2ab+l')+2b-2a+\=(b-a)2+2(b-a)+1=(b-a+1)2R16⚓/27⚓

16ᓽ.C=l-ôᱏ1)Hx(*1)-(y-1)]2=[(y-1)(x-1)]2=(*-1)2(xù1)2.ᦑ$ᫀN(y-1)2(x-1)2.f+ïCᑖ'ḄóA+(1)?@ABCD.ma+mb+mc=m(a+h+c).(2)úCA:ûᐰ¢óúC¢óüúC.(3)ᓝþ°ÿ.ᑖḄᑖ⌕ᶇᐰᣚᐗḄᮣᵨᐰ,ᑭᵨᑖḄ!".17.᝞'()0()Ḅ-./1,PQ2Ḅ3.n56Ḅ789:;PQ᣸ᡂᑡᑗ789:@ᐵBPQCDᐸFGG௃BiCiḄ⚔MAiOMPPᔠRSGA2B2c2Ḅ⚔MA22BQOPQḄVM…Ḅ⚔MBnஹCnᙠᙊ.᝞'1,[n=l789:Ḅ^_ai=a᝞'2,[n=2789:Ḅ^_a2=:ফdবf1+3/ூ᪆௃ூᑖ᪆௃(1)lPQO4GVBMD,pq50,st0D=4஺*ᵨwxḄyᦪ⊤|0D,ᙠG()3DF,᪷~ᳮt789:Ḅ^_0a(2)lPQOVBME,pqᐸ஺st0E=4E-O4,ᵨw9Ḅyᦪ⊤|0E,ᙠF᪷~ᳮt789:Ḅ^_஺2a(3)lPQO஽C,VBMF,pq0,st0ᡝᔆ-04,,ᵨwanḄyᦪ⊤|OF,ᙠA05.FF᪷~ᳮt789:Ḅ^_an.ூ௃(1)᧕)AJ151C,Ḅ/ᑣ^_/R17⚓/27⚓

17••Cl\=5/3.(2)lZU151GḄ/2஺=1᝞p0,lO0VᓟM£ᑣᨵm=2/1.ggOR+BG%.,.1=(24—1)2+(a஺2ஹ*•,/?=2""2»I=0/3«2-l)2+-B«22»24s¨©13(3)ª(2),p஺%HB“C”KPQ

18X..•3ºy=x+4O½¾º*5VBAஹBÀMx/.a+c=~4,ac=-k,/.(c-a)2=(c+a)2-4ac=16+4k,•,•AB=2>/L..•ᵫᳮs:(c-a)2+[c+4-(a+4)]2=(2^2F,2(c—a)Ë8,(c-a)I/.16+4k=4,s©k=-3,ᦑÍᫀ/-3.MÏ©Ð⚪ὃÓÔÕᦪO6Ö×ÕᦪḄVMᡂØஹ᪷OÙᦪḄᐵÙஹᳮஹ'ÚMḄᙶ᪗ᱯÞß᪗⚪ᐹᨵḄy⊤ឋâᔠឋãᨵäå.19.᝞'2²ã᪷~ᐰçªèéêëìᵯî⁚ðḄñᦪòóᑴḄÀõö÷øḄùú'ᑣéê“ü”⁚ðḄñᦪ2—ñ.Xÿூ
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20R.2x+2)+2z%-2xy-2xz-2yz=0,•..(x-y)'+(x-z)°+(y-z)M...ஹÕzᙳG¯ᦪ×(x-y)2>0,(x-z)2>0,(y-z)">0....(x-y)2=0,(x-z)2=0,(,•z)2=0.♦*x=y=z.3+1)3+1)(ᑘ+1)Ú(Û+1)(*2+1Ü2+1)>2+1)(/+1)(z2+1)(x2+l)(y2+1)(z2+l)ூI௃⚪ὃ\yËḄᓄஹÝ0ÞËḄ¥ᵨᨵgßḄàáàIpឤyKᮣä¥ᵨåᐰçèÞËéᓄGoêᦪḄG³pᐵᏉ.23.ᙠᓅíîïðᐰñᦻóôõ◤#30÷øùὅûü“ýᦻó᪛ÿ”ᐸᵱ18᝕12A.(1)30⌱!"#“%&ᢞ(”)*ᕒ,⌱ᑮ᝕Ḅᭆ᳛1(2)“2ᑜ”4ᙠᵬஹ89⌱-;<⚜ᜓ?@AḄBCDEᵫGHI@AJᑣ᝞M1NOPQ☢ᦪTᑖV#2,3,4,5Ḅᡫ[Q\ᒴ^ᦪT_M`ab☢I!2PQ☢ᦪTcd#ᏔᦪᑣᵬHIᔲᑣ8HI.ghi@Ajᔩlmᵨ᪛p(ᡈᑡ⊤t▊vᳮᵫ.ூyᫀ௃(1)1;(2)}jᳮᵫ~*᪆ூ*᪆௃ூ*௃ᑖ᪆1(1)ᑭᵨᭆ᳛C(4Ḅᭆ᳛(A)Ḅᦪ"ᑗḄᦪ.),ᓽ(2)I!2PQ?#!"PQ}`ᯠ^!"PQᑭᵨᑡ⊤t⊤ᑗᑭᵨᭆ᳛C,ᦪTcd#Ꮤᦪd᜻ᦪḄᭆ᳛ᓽyᫀ.*1(1)..ᨵ30¡ὅ⚜ᜓ£¤ᐸᵱ18᝕1212230⌱!#“%&ᢞ(”)*ᕒ⌱ᑮ᝕Ḅᭆ᳛#1(2)⊤¥᝞M:2234512(2,3)(2,4)(2,5)3(3,2)(3,4)(3,5)4(4,2)(4,3)(4,5)21⚓/©27⚓

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22AF8*1AF=2y/5.25.úÑ#ûÏüý<þ᜜Ḅ◤⌕᣸ᳫᳫ.ᳫḄᓫ᣸ᳫḄᓫ30ᐗᵨ500ᐗḄ᣸ᳫᦪᵨ800ᐗḄᳫᦪ.প᣸ᳫᳫḄᓫᔜ"#ᐗ$ফា'ᵨ(1200ᐗᨵ,-./$ூ1ᫀ௃প᣸ᳫᓫ"50ᐗᑣᳫᓫ"80ᐗ5(2)ᨵ8.5জ/᣸ᳫ5/ᳫ16.ঝ/᣸ᳫ10/ᳫ8.ூ<᪆௃ூᑖ᪆௃(1)?᣸ᳫᓫ"xᐗᑣᳫᓫ"(x+30)ᐗ᪷C⚪EFᐵH5500ᐗḄ᣸ᳫᦪ=800ᐗḄᳫᦪᵫᐵHFKLM<ᓽFO(2)?ា'ᵨP1200ᐗF/᣸ᳫm/ᳫn᪷C⚪EF᣸ᳫḄᓫx᣸ᳫḄᦪm+ᳫḄᓫxᳫḄᦪn=1200,MT᦮ᦪ<.ூV<௃(1)?᣸ᳫᓫWXᐗᑣᳫᓫW(x+30)ᐗᵫ⚪E5500=800xx+30<5x=50,YZ[5x=50"\ᑖ]KLḄ<ᑣx+30=80.15᣸ᳫᓫ"50ᐗᑣᳫᓫ"80ᐗO(2)??ា'ᵨP1200ᐗF/᣸ᳫm/ᳫn8ᵫ⚪E550m+80n=1200,᦮ᳮ5m=24--n,,bmஹnd"e᦮ᦪ.♦.জn=5fm=16,ঝn=10fm=85..•ᨵ8.5জ/᣸ᳫ5/ᳫ16Oঝ/᣸ᳫ10/ᳫ8.26.᝞ijklmnABCDstAWᙊvABWwxḄᙊyADzF,yBCzG,}~BAyᙊzE.(1)ED(DAᑗᑨGD0AḄᙢᐵHḄO(2)ᙠ(1)ḄᩩḄGC=CD,ᓃC.23⚓/27⚓

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26.*.y=2x-2,y=2x-2y=adax-ᑣ<2aax?+(a-2)x-2a+2=0,(x-1)(ax+2a-2)=0,'x=lᡈx=8-2,a•••N<ᙶ᪗[(Z.2,16),aaVa

27y=-x:-x+2ᵫy=-2x-x2-x+2=-'DX]=2,X2=-l,AG(-1,2),.••

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