2022-2023学年河北省秦皇岛市数学九年级上册期末联考模拟试题含解析

《2022-2023学年河北省秦皇岛市数学九年级上册期末联考模拟试题含解析》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。

2022-2023
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14ᙠX'AB'^ylAB2+BB'2=<42+32=5ᓽ⇪⇩üKḄᨬýþT1.(2)ÿA4',ᑣAAḄ⇪⇩Ḅᨬᙊ┵☢☢(ᡧ)Ḅ,ᑣ!='|=4,ᵫ⚪()*2,=1--2nᓽ2xᐔx—=xᐔx4A3180/.n=60;.?@AᨬAAf=PA=4.(3)᝞ঞᡠE=ᙊ┵Ḅ☢FAGACLPAHIC,ᑣJKACḄL=⇪⇩Ḅᨬ.ᙠRtAACPNVZP=60°,:.ZPAC=30°:.PC=-PA=-x4=222/.AC=V42-22=2V3•••⇪⇩ḄᨬST26ூIV௃X⚪ὃZ[\]^ᳮ`Ḅឋbᙊᕜdefde>?@AḄᑨ^hឋbiA@AḄឋbjklᐵdehឋb^ᳮ=X⚪Ḅn⚪ᐵo.,1020ஹ(1)y=—/+3x+4s(2)t0

15
3ᵫ⚪Ä᪷PEDEḄᐵÔ(KLᐵ#mḄÒÓ(᪷ÒÓ᪷ÒÓ(ᓽKLÁᫀ._(_l)2_"c=0ூ௃!1ᵫ⚪ÄL-42+4஻+c=0b=3,Lïc=4.(ðᩩᱥiḄhᦪ⊤óô&y=-x2+3x+4.
2õx=0ö(y=4....஺Ḅᙶ᪗&S஺(4.E:ḄhᦪᐵÔô3y=kx+n.n=4,ᵫ⚪ÄLᓃø4ᦇ+஻=0.[஻=4.•:6CḄhᦪᐵÔô3y=t+4.•PD஻x(y=y=-m2+36+4.PE:.x=ivi1-3m.EõOvm<3ö(᝞Dজ(d——trr+3m•õ3<ú<4ö(᝞Dঝ(d=nr-?>m.VPE=2DE,:.-nr+4m=2(-/n2+3fn).Lü=0S¤ᔠ⚪Ä([\_((=2.

16t3<஻2<4wDE=nr-3mfPE=-m2+4m.VPE=2DE,:.-nr+4/n=2
m2-3m/.n)=0ᔠ⚪(¡¢=.£¤ᡠ¥tPE=2DEw|=2ᡈ§=3.3ூIV௃X⚪ὃZy¨ᦪ£ᔠ⚪ᑭᵨ^ᦪ«ᦪn᪆esᑭᵨ¬HxiJ¤IḄᙶ᪗l>)EIḄᙶ᪗=n⚪ᐵosᑭᵨPEDEḄᐵ)ᐵHmḄ®=n⚪Ḅᐵo.21ஹ1
¯¨°±Ḅ²ᑖ᳛20%2
¯ᓟµ¶·¸¹L5ᐗwᖪ¼½)Ḅᑭ¾Wᨬᜧᨬᜧᑭ¾=6125ᐗ.ூᑖ᪆௃1
¯¨°±²ᑖ᳛|)®50
1y=32,«nᓽ2
᪷├Áᑭ¾=├ÁXÁ¹Â¹¡ᑡ¯ᜩḄ├Áᑭ¾Wᐗ¡¡¸¹xᐗÅḄᦪᐵe.ᓽ«n.ூÆn௃n*1
¯¨°±²ᑖ᳛|᪷⚪()50
1-m2=32,n)Ç=0.2,⛷=1.8ᔠ⚪(¡*¯¨°±Ḅ²ᑖ᳛20%2
¯ᓟµ¸¹xᐗᵫ⚪()*W=
10+x500-20x=-20x2+300^+5000=-20x-7.5É+6125Va=-20<0,Êᔣ°Wᨵᨬᜧ...tx=7.5ᐗ¡wÍᜧ=6125ᐗ¡*¯ᓟµ¶·¸¹1.5ᐗwᖪ¼½)Ḅᑭ¾Wᨬᜧᨬᜧᑭ¾=6125ᐗ.ூIV௃X⚪ὃZ[y¨ᦪḄឋbᙠÎ▭ÐÑNḄᵨ.ᨬᜧ├Áᑭ¾ḄÒ⚪ÓᑭᦪḄÔÕឋᩭn✌ᐜ⌕ᔛÛ⚪(Ü^ÝÞᦪßàᯠâᔠÎ▭⌱äᨬå®ᫀ22ஹ
1j=1440x-800¯æ¨çèḄéèêᨬëìH3ᐗs2
y=-120/+2040í-8003
¯æ¨çèḄéèê^8ᐗîwḄïðᦈᐭ7840ᐗ.

17ூᑖ᪆௃(1)᪷⚪(hde*ïðᦈᐭ=¯ᜩᐳᦈôḄéèê-¯ᜩḄõ^öᓽ«yxḄᐵeᯠâ᪷ïðᦈᐭìH2512ᐗᑡ>eᓽ«xḄᨬç᦮ᦪs(2)᪷⚪(hde*ïðᦈᐭ=¯ᜩᐳᦈôḄéèê-¯ᜩḄõ^öᓽ«yxḄᐵes(3)᪷xḄôùᑖúûü*tx<5w᪷¨ᦪḄÔÕឋᓽ«îwyḄᨬᜧstx>5wýy¨ᦪÂþeᓄ⚔ᓽyḄᨬᜧ.ூ௃(1)ᵫ⚪j=1440x-800V1440x-80022512,x22.3•••᦮ᦪ...Xᨬ"3,ᓽ#$%"&Ḅ'&(ᨬ)*+,3ᐗ..#$"&Ḅ'&(ᨬ)*+,3ᐗ/(2)ᵫ⚪y=[1440-120(x-5)]x-800ᓽy=-120^+2040^-800(3)1x25,,:1440>0,...y4xḄ5ᜧ5ᜧ.•.1x=5,ᨬᜧ67ᦈᐭy=1440x5-800=6400(ᐗ)1x>5y=-120<+2040*-800=-120(x2-17x)-80017=-120(x------)2+78702171■yᨵᨬᜧ.@xAB᦮ᦪ.♦.X8ᡈ1.Dᯠx8"&'F$%GHᨬᜧ67ᦈᐭy=-120I+7870=7840(ᐗ)4T7840ᐗ>6400ᐗ•••#$%"&Ḅ'&(JK8ᐗḄ67ᦈᐭ7840ᐗ..#$%"&Ḅ'&(JK8ᐗḄ67ᦈᐭ7840ᐗ.ூL௃⚪ὃNḄOP%QᦪRS%QᦪḄTᔠJᵨWXY▭[⚪\Ḅ]^ᐵ`ஹP%QᦪḄ5bឋRᑭᵨS%Qᦪᨬ

18Oe⚪Ḅᐵf.23ஹ(1)12(2)ghi/(3)(-a,-b).22ூᑖ᪆௃(1)ᐜmABnopqrsḄtᑭᵨ☢vwᓽaABCḄ☢v/(2)᪷y⚪ᑭᵨz{\|}ᐵ~ABC,ABCḄ}{12ᓽ/(3)᪷y(2)Ḅghᑭᵨ}{12,ᓽᑮ.ᫀ.ூ௃(1)ᵫ^ABCḄ⚔ᙶ᪗ᑖA(-2,4),B(4,4),C(6,0),nAB=6,t4,ᡠm4ABCḄ☢v12ூL௃⚪⌕ὃNgh-z{ᣚ⚪ḄᐵfOWXz{ᣚḄKIRឋyᣚḄJ.ூᑖ᪆௃~᦮ᳮᑭᵨᑖᓽ.ூ௃~᦮ᳮ3x(lx+l)-l(lx+l)=0,ᑖ(3xT)(lx+l)=0,3xT=0ᡈlx+l=0,,21X]=~9X2=~~•3225ஹ(1)i᪆/(2)CE=).ூᑖ᪆௃(1)OD,ᵫr¡ᑖ¢R]£]r6ᑮNEBD=NBDO,ᑣBC஻OD,ᓽᑮᡂ¦/(2)A஺CD,CO,ᵫ¨©KᳮAD,ᯠ9EDRs9DAR,DEḄª«ᯠᓽCEḄª«.ூ௃(1)᝞hOD.

19Q8O¡ᑖNABC,:.AEBD=ZABD.,:OB=OD,:.ZBDO^ZABD.:.ZEBD=ZBDO.:.BC//OD.:.ZFDO=ZE.,

20DE=—.3,:NEBD=ஹNCOD,ZABD=-ZAOD,ZEBD=ZABD,22:.ZCOD=ZAOD..-.CD=AD=1.ᙠRfACDE+,CE=JC£>2_DE?=,ூL௃⚪ὃNÆ}{qrsḄឋRᑨK¨©Kᳮᑗ¢ḄᑨKᙊᕜrKᳮ]ÊḄJᵨ⌕ὃNËÌÍᵨឋÎÏÐᳮRopḄBÑÒ"⚪⚪ÓÔÕÖÔᐹᨵPKḄØ⊤ឋ.26ஹÛ1ÜজA,C.ঝP13-0ᡈX”Ly=/—2ḄNR,SQRST.

21•.U=*-2,y=x..X]=~"1,஽=2[y=Tl%=2..••R(—1,-1),5(2,2).(2)᝞H"ᙊLcᩩF7Ḅeᔣgh7iᑗBḄcklm⌕."^=3=0=-3,/.A(-3,0),OA=3x+x"x=0y=+3=3<.C(0,3),OC=3x<.OA^OCVZ4G>C=90°...NC4O=45஺AH.=-----=—=5/2:.1sin45°V2|VA(-3,0):.XH-—3+}ᳮ%,=3-V2...7EF8}ᙠHGḄ89H89ᙊHḄᙶ᪗,ḄBx“>3-ᡈ

22x஻<-3+\/5.ூa௃b⚪ý⌕ὃd8ghᦪghᦪḄeᔠ(Ï(DÏkCḄᭆ&⚪Ḅᐵ~.