山西省（临汾地区）2022-2023学年八年级数学第一学期期末监测模拟试题含解析

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2022-2023
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6ூᑖ᪆௃᪷ìðîðñùËRḄéà´bùËḄnúOP=AB.ூ௃F,•,AO_LBO,PABḄé0/.OP=—AB,2.•.ᙠü?Ḅý²éOPḄãþ³Ò.ᦑ⌱FC.ூ௃⚪ὃ£;ìðîðñùËRḄéà´bùËḄnúḄឋ¶0§¨ឋ¶⚪Ḅᐵ¤.6ஹDூ᪆௃Ꮇᵬஹ⍗Aஹ3ᵬAᙢᑮ8ᙢ⌕“ᑣᵬḄ8ᙢᑮAᙢ⌕஻ᑣḄ᪷⚪!Ḅ"#mnᐵ%ᑡ'()*+ᓽ-.ூ0+௃Ꮇᵬஹx⍗Aஹ3ᵬAᙢᑮ8ᙢ⌕3ᑣᵬḄ5ᙢᑮAᙢ⌕m“ᑣḄn᪷⚪4ᑡ()gx+9x=a,mnᦑ⌱:D.ூ89௃:⚪;⌕ὃ=ᑖ?()Ḅ@ᵨ+⚪ḄᐵBCᑖ᪆⚪4E'⚪!Ḅ"#ᐵ%.7ஹBூᑖ᪆௃ᑭᵨᚖHIᑖJḄឋLMᳮᓽᚖHIᑖJḄ8ᑮJOPQḄ"R"#Sᣚ-U.+VWXOC,V80ᙠJO8CZACḄᚖHIᑖJ,.*.OB=OC,OA=OCOA=OB=5cm,

7AAOBḄᕜ^=04+05+48=18
cm,ᦑ⌱VB.ூ89௃:⚪ὃ=JOḄᚖHIᑖJឋL_`ᚖHIᑖJḄឋLMᳮ:⚪ḄᐵB.8ஹCூ+᪆௃a⚪ᑖ᪆V᪷bcMᳮᓽ-UᑮAB,BC,ACḄ^deᑨgᓽ-.a⚪+᪆VWXAC,᝞iV᪷bcMᳮ-jUᑮVAC=BC=75.AB=VIO.VV5
V5
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..,.AC'+BC^AB1....ABCC"ῪHlmln./.ZABC=45°.ᦑ⌱C.ὃ8VbcMᳮ.9ஹDூᑖ᪆௃ᐜᓄqrs*᪗ḄuvI(᪷ᓽ-.ூ0+௃716=4,4ḄuvI(᪷C1,JwḄuvI(᪷1.ᦑ⌱xVD.ூ89௃:⚪ὃ=uᦪI(᪷ḄuᦪI(᪷z⚪_`*{|ᦪḄuvI(᪷Ḅ)}Cᐜᓄq~|ᦪs*uvI(᪷C+⚪ᐵB.10ஹDூᑖ᪆௃ᐜ᪷IenḄឋLUᑮABAC=ZACD=70°s᪷ᚖHḄMmlnḄᑁlZ*'ூ0+௃•••nABCDIen/.AB/7CD,

8ZMC=ZAC£>=70°•BE±AC.ZABE=^°-ZBAC=20°ᦑ⌱D.ூ´௃¶⚪·⌕ὃ¸¹ºᑁḄ&&⚪Ḅᐵ¼½3¹ºḄឋ¿.TஹÀÁ⚪(}⚪3ᑖᐳ24ᑖ)11ஹ1ூᑖ᪆௃᪷(ÃÄᦪḄឋ¿ᑡÅmaஹbḄ%ᯠMÆᐭÆᦪÅI¹ÈÉᓽË£&.ூÌ&௃᪷(⚪Í£a-4=2,b+3=2,&£a=4,b=-3,ᡠÎx1a+b=,4-3=1-ᦑᫀ!1.ூ´௃Ï⚪ὃ¸JÃÄᦪḄឋ¿!ÐÃÄᦪḄ2ÑLÐÃÄᦪ2.Òὃ¸JÉÓ᪷.12ஹ-7ூᑖ᪆௃ᵫ%Ô£ᑮᑖÅÕ&ÕᓽË.23ூÌ&௃ᵫ⚪Í£!——=^,x+1x-22x-4=3x+3,x=-7,ÙÚÛ!x=-7ÜÕḄ&ᦑᫀ!-7.ூ´௃¶⚪ὃ¸ᑡᑖÅÕÝ&ÕÞᑖßm:àÕḄ&MÚÛ᪷(&ᑖÅÕḄáâ&Õ.13ஹ0.1ூᑖ᪆௃mS4ãᦪ(Ḅ⚣ᦪᓽËåmᐸ⚣᳛.ூÌ&௃᪷(⚪Í£!40-(7+8+15)=10,ᑣS4ãᦪ(Ḅ⚣᳛10+40=0.1.ᦑᫀ0.1.ூ´௃

9Ï⚪ὃ¸J⚣᳛ç⚣ᦪèé⚣᳛ç⚣ᦪêëḄᐵ&Ï⚪Ḅᐵ¼.14ஹ1.02x10-7ூᑖ᪆௃ì%1ḄᦪÒËÎᑭᵨíîïᦪð⊤:òÅaX10,çóᜧᦪḄíîïᦪðQcḄᐸᡠõᵨḄÄᢣᦪ÷,ᢣᦪᵫÜᦪøùS:QúḄᦪûü☢Ḅ0Ḅᦪᡠýå.ூÌ&௃&:0,000000102=1.02X101,ᦑᫀ!1.02X101.ூ´௃Ï⚪ὃ¸ᵨíîïᦪð⊤óḄᦪ:òÅaxnr,ᐸiW|a|<10,nᵫÜᦪøùS:QúḄᦪûü☢Ḅ0Ḅᦪᡠýå.15ஹ1.5

10.,.1.1

11a+la+1(ci-2)~_4-a2a+\x~a+\(a-2)2_2+a2-a••,⌕¾ᑖ?ᨵ4ᦑa+l#O¿a-2#0,T¿aW2,2+1.,.°a=l®?=----=1.2-189V:⚪ὃ=ḄCᑖ?Ḅᓄq*¸_`ᑖ?Ḅ±ᔠ³uᑣC+⚪ḄᐵB.20ஹ(1)Á+᪆(2)Âᙠ°U2ᡈ14sj£>ஹEஹ5⚔8ḄmlnCHlmln.ூᑖ᪆௃(1)ᵫḄឋL-UCD=CE,ZDCA=ZECB,ᵫ"mlnḄᑨM-UÈÉ(2)ᑖÊËÌᵫḄឋLZHlmlnḄឋL-*+.ூ0+௃(1)wÍV•.•ÎAC஺Ï8C⌮┐(ᔣ60஺UᑮBCE,AZDC£=60°,DC=EC,C"mln(2)+VÂᙠ,জ°OWtV6sᵫ-ZABE=60°,ZDBE<60஺,/BED=90஺,ᵫপ-CZJEC"mlnA"EC=60஺A"EC=60°,/.ZCEB=30°,VZCEB^ZCDA,•••NCZM=30°,VZC4B=60°,...ZDCA=ZCDA=3O°,J.ZM=C4=4,.OD=OA-DA=6-4=2,.*./=2-?l=2sঝ°6VtV10sᵫN05E=120o>90஺

12...ÖÂᙠঞ=10s8஺88×ᔠ.••ÖÂᙠট°f>10sᵫḄឋL-ZCBE=60°ᵫ(1)NCQE=60஺ÙNBDE=NCDE+NBDC=60“NBDC,rN8OC>0஺ÚZBDE>60°,,ÛÜN3OE=90஺rNBCZ)=30஺.BD=BC=4cm,At>D=14cm,.*./=14-rl=14sÝᡠÞV°U2ᡈ14sj஺ஹEஹ8⚔8ḄmlnCHlmln.ூ89௃:⚪CmlnÝᔠ⚪ὃ=ᐰ"mlnḄឋLḄឋL"mlnḄឋLᑭᵨᑖßàÉáâ+ãz⚪C:⚪ḄᐵB.21ஹZBAD=40°,ZAOC=115°.ூᑖ᪆௃ᐜ᪷HlmlnḄP|┦låæ*Us᪷lIᑖJḄM*UZCAE=-NBAC=45°,ZACF=-ZACB=20°,ᨬ᪷mlnᑁlZMᳮ22*UAOC!ZAOCḄᦪ.ூ0+௃CìNB=50஺R3ABD!NBAD=90-50'=40,NBAC=90°,N8=50",.,.A5C!NAC3=9(r-5(r=40஺,AE,CFClIᑖJNCAE=-NBAC=45°,ZACF=-ZACB=20%22...AOC!ZAOC=180°-45°-20°=115°.22ஹ(1)1(2)2.ூᑖ᪆௃(1)᪷⚪4-jÎ⚪!Ḅ?ûᓄᩞᧇ!Ḅn?r-jUᑮxஹy

13Ḅ';<=ᑮ2x+yḄ'>(2)᪷a-b=Lab+c2-6c+12=0,=ᑮaஹbஹcḄ';<=ᑮa+b+cḄ'.ூ.+௃+0(l)Vx2+2xy+2y2+2y+l=0,A(x2+2xy+y2)+(y2+2y+l)=0,.,.(x+y)2+(y+l)2=0,/.x+y=O,y+l=O,+x=Ly=-L2x+y=2xl+(T)=lফa-b=L:.a=b+L/.Aa=b+lBᐭab+c2-6c+12=0,b2+1b+c2-6c+12=0,A(b2+lb+l)+(c2-6c+9)=0,.\(b+2)2+(c-2)2=0,b+2=0,c-2=0,+b=-2,c=2,:.a=b+l=-2+l=2,a+b+c=2—2+2=2.ூDE௃F⚪ὃIJKLᑖ+NOḄᵨ0ᑭᵨKLᑖ++P#'Q⚪>ᑭᵨKLᑖ++PQ⚪>ᑭᵨKLᑖ+RᓄTUQ⚪.F⚪+VḄᐵX4⌕Z0ᵨKLᑖ+ḄNOAL[\]᪷^_ᩩa\Ḅ=4᦮cBᦪLe=4ᐸ6Ḅghᑖ.23ஹ(1)120a>(2)150ᐗ.ூ+᪆௃k⚪ᑖ᪆0(DlmᖪopqḄgᢇst4xaᑣpqvᢇwxstly2xaᵫ^_,wxst|10ᐗᑡ$N~#+ᓽ.(2)lastḄ᪗yaᐗᵫ(1)$gᢇvᢇḄq;<#$ᑭ⊤LᯠᑡL+Vᓽ.k⚪+᪆0(1)lmᖪopqḄgᢇst4xaᑣvᢇst42a.ooonn13200ᵫ⚪0--------------=10,+x=12(),x=1204N~Ḅ᪷.2xx(2)lastḄ᪗4஺ᐗ.ᵫ(1)gᢇḄqy013200+120=110(ᐗ/a)vᢇḄqy0120(ᐗ)ᵫ⚪0

14120x(a—110)+(24()—50)x(a—120)+50x(0.8a—120)>25%x42(XX)+0350cz>525(X),ᡠ=«>15(),ᓽastḄ᪗4150ᐗ.ὃD01ஹᑖLN~Ḅᵨ2ஹgᐗgLḄᵨ.24ஹপ+᪆>C(3,2)(2)+᪆.ூᑖ᪆௃(1)ᑭᵨDAḄᙶ᪗DBḄᙶ᪗ZD☢ᙶ᪗ᑏ$DCḄᙶ᪗ᓽ>(2)ᑭᵨᐵxḄDḄᙶ᪗ᱯ¢ᑏ$AiஹBiஹGḄᙶ᪗ᯠ£DᓽᑮAiBiCi.ூ.+௃প᝞2ᡠ¤>C(3,2)ফ᝞2ᡠ¤0ூDE௃¦⚪ὃIJ§2——\ᣚ=ª☢ᙶ᪗+⚪ḄᐵX4«¬®Ḅឋ°±Z☢ᙶ᪗.25ஹ(1)+᪆>(2)+᪆B(-l,-3)2ூᑖ᪆௃(1)ᑭᵨᐵyDḄឋ°0²ᙶ᪗\³ᙶ᪗´yµᦪ$D¶·ᓽ$Vᫀ>(2)ᑖ¹§$DAiஹBi.Gᔣ»¼3cᓫ¶ḄDᯠ¾¿ÀÁB2Ḅᙶ᪗ᓽyDBi²ᙶ᪗Â3ᓽ.ூ.+௃+(1)᝞2AiBiCi,ᓽyᡠ#>(2)᝞24A2B2c2,ᓽyᡠ#B(-1,-3).2

15yூ"#௃%⚪ὃ()᪷+,-./ᣚ123/ᣚ45,67%⚪Ḅᐵ:;᪷+<=>᪀4@-A"ḄBCDEFGHI.26ஹ1AKLMᳫḄᓫPQ50ᐗD8KLMᳫḄᓫPQ60ᐗ2X=45xf60x
0

16ঝÄx>10]y=60xl0+(x-10)x60x0.7=42x+180.2Å5ᡠÆ0X=45x60x(010)(3)pÇAÈÉ045x15=675(ᐗ)>pÇBÈÉ015>10,42x15+180=810,675V810,ᡠ=pÇAÈÉḄÊᳫÌᑜU.ூDE௃¦⚪Î⌕ὃIvᐗgN~ÏgÐᦪḄÑ▭ᵨ±Zᑡ$vᐗgN~ÏgÐᦪ4+⚪ᐵX.