桂林市2022-2023学年数学八年级上册期末联考试题含解析

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2022-2023
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17U⚪ὃWt$᪷ḄöᔠlîlîÕᑣ÷rî⚪ᐵ.24ஹᬒùḄᓫûK25ᐗýþḄᓫûK5ᐗூ᪆௃ÿᩭᬒḄᓫᔜxᐗyᐗ᪷ᐵ2ᬒḄ+10Ḅ=100ᐗ2ᬒḄ+0.9x10Ḅ=95,ᑡ!"#ᓽ.ூ'#௃)ᩭᬒḄᓫᔜxᐗyᐗ2x+10y=100᪷⚪+,2x+0.9xl0y=95x=25#y=5-ᬒḄᓫ.25ᐗḄᓫ.5ᐗ.ூ/0௃1⚪ὃ345ᐗ67!Ḅ8ᵨ#-1⚪Ḅᐵ:;<⚪+)=>?ᦪA=ᔠ〉Ḅᐵᑡ!"#.25ஹEFGH.800ᐗ⏀JKLHᨵ50H.ூᑖ᪆௃)PFGHQ.xᐗR⏀JᨵVHKLHᑣEFTGHᓫ.U+ᐗ᪷XYᦈᐭ=KLHḄᓫxᐭ]Ḅ^Hᦪᓽ=ᐵ_X,yḄ!#`ᓽ=ab.ூ'#௃#)PFGHQ.cᐗR⏀JᨵyHKLHᑣEFTGHᓫ.x(y-12)=22800n41+-lx=-x600=800,-EFGH.800ᐗ⏀JKLHᨵ50H.ூ/0௃1⚪ὃ345ᐗ67!Aeᐵfgᑡ=!#⚪Ḅᐵ:.

1826ஹ(1)A(-3,0),B(1,0),CD=2
(2)G5᪆;(3)6.ூᑖ᪆௃1✌ᐜᑭᵨOPQḄRSឋTU஺=-3V=1,ᓽWTUAஹBḄᙶ᪗ZTUABஹBC,ᯠ\ᵫNCBA=60஺TUNODB=30஺^_TUBD,TUCD

2✌ᐜᑨaACEPஹABC1b+*,^_ᑨacCBEgZkCAP,ᯠ\ᑭᵨ*dbḄᐵeTUDO=OF,ᓽWᑨaDஹFᐵxfPg)h£6iE஺ᐵxfPgḄPgZ
3DI஻AB,ᑨacCDI1b+*,ᯠ\ᑨaAMDI0NDB,TUNB=MI,^_TUAN-AMḄQ.ூj5௃1Va26a+9+7^4=0,ᓽa+3?+7^1=0+a+3=0,஺-1=0a=-3,b=\
.A(-3,0),B(1,0),AB=BC=4,VZCBA=60°ZODB=30°.,.BD=2OB=2/.CD=BC-BD=4-2=2
(2)lmEBnfF,opCE,᝞ᡠ::CEP1b+*,/.ZECP=60°,CE=CPᵫ(1)

19AACBE^ACAP(SAS)/.ZCEB=ZCPA/.ZEBP=ZECP=60°:.ZFBO=ZDBO=60°:.ZBFO=ZBDO=30°BD=BFVBO±DF.*.DO=OF.•./DஹFᐵ_xijk•••lmno/஺ᐵ_xijkḄjk/q(3)o/DrDI஻ABsAC_I,᝞ᡠv:ᵫ(2)yABC.z{|}ᑣACDI.z{|}.*.DI=CD=DB.,.ZMID=120°=ZDBN/.AMDI^ANDB(AAS)
.NB=MI/.AN-AM=(AB+NB)-AM=AB+MI-AM=AB+AI=AB+BD=4+2=6ூ/0௃⚪~⌕ὃ3z{|}Ḅឋᐰ{|}Ḅᑨឋ?ᓽ#⚪.