浙江省宁波市镇海区2022-2023学年数学九年级上册期末监测模拟试题含解析

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2022-2023
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14I<ᵬÆÇᳫÉḄÊË30ᐗÍÆÇᳫÉḄÊË70ᐗ.µ2¸§×᪥ÒᵬÆÇᳫ”ÉᑣÒÍÆÇᳫµ100-ë¸É.ᵫìíîï4µ100-᪷¸.:î280.¦îW90,.-.800.23a<29.4᦮ᦪ.•.ᨵ28ᫀ.ூ:;௃=⚪ὃ@ABᐗCDEFḄGᵨஹCᐗCDJKLḄGᵨ2M=⚪ḄᐵOPQR⚪STUᡠWX⚪◤⌕Ḅᩩ\,ᑭᵨJKLḄឋ_2MX⚪.20ஹ—,`2᪆ூᑖ᪆௃ᑡ⊤efgᡠᨵKhiḄjkᦪTUᵬஹ⌱mn1oᵯqḄjkᦪᯠsᑭᵨᭆ᳛vLW2.ூw2௃2xᑡ⊤᝞zx1ABcA(44)(45)B(3.A)(B,B)(&C)C(C,A)(G5)(GC)ᵫ⊤h|ᐳᨵ9Khijkᐸ⌱mnCoᵯqḄjk3,31.P⌱mnCoᵯq93ூ:;௃=⚪ὃ@Aᑡ⊤e᪛exᑭᵨᑡ⊤eᡈ᪛efgᡠᨵKhiḄjkn,⌱Uᔠ\AᡈBḄjk

15ᦪøm,ᯠUᑭᵨᭆ᳛û+üýþGAᡈ
BḄᭆ᳛.21ஹ(1)᪆(2)᪆(3)(-3,1)ூᑖ᪆௃(1)᪷A(0,2)ஹB(3,3)ஹC(2,1).ᙠᙶ᪗ᓽ(2)᪷Ḅ!"Ḅ#$ᡈ&ᜧ()Ḅ*+ᓽ,ᑮ!"Ḅ./01ᙠᦋ3Ḅ456ᢝ893(ᜧ$3)ᓽ,<ᫀ.(3)ᑭᵨ(2)0@1A,<ᫀ.ூB௃প᪷A(0,2)ஹB(3,3)ஹC(2,l).(2)Ḅ!"Ḅ#$ᡈ&ᜧ()Ḅ*+ᓽ,ᑮ!"Ḅ./0஺ᡠF0᝞HᡠIJKḄL!"⚔NḄᙶ᪗ᑖOPJ(-3,1)ஹ(3,3)ஹ(1,-1).(3)ᑭᵨ(2)0@1A,<ᫀ.ᦑ<ᫀR(-3,1)ூNS௃T⚪ὃWᙶ᪗X0ឋZ1[/3ᣚ1⚪ᐵ^ᙠ_`ab0cᑣ.22ஹ(1)3,1(2)36°(3)ூᑖ᪆௃(1)᪷Bfᨵ6+4=10h1ᡠᓰḄ*+P50%,Tᓽj,khᦪ1ᑭᵨkhᦪmn!"Ḅ*+ᓽj,CfḄhᦪ1ᯠpj,Cf᝕rhᦪ1sᳮj,DfᵱrḄhᦪ(2)ᑭᵨ360ஹvw⚜y9z᪗{ᑖ*1ᓽ<(3)ᑭᵨᑡ}cᓽ⊤Iᔜ1ᯠpᑭᵨᭆ᳛ᓽj.ூB௃(DCfrhᦪJ20x25%=5()

16Cf᝕rhᦪJ5-2=31஺frᓰḄ{ᑖ*J1-15%-50%-25%=10%,஺frhᦪJ20x10%=21஺fᵱrhᦪJ2-1=11ᦑCf᝕rᨵ31஺fᵱrᨵ1⊡ᐙᩩ0,ᦑ<ᫀR3,1(2)360°x(1-50%-25%-15%)=36°,

17ᳫḄᨵ5jk᪷ᭆ᳛vLᑖUᔜḄᭆ᳛ᜧ
ᓽh.ூw2௃(1)᪛᝞zxᵫ᪛|ᐳᨵ6Khijkᐸ᥎UḄ2ᳫPᳫḄᨵ2jk21ᡠ᥎UḄ2ᳫPᳫḄᭆ᳛-=-¢6331(2)•••᥎UḄ2ᳫ£⁐¥nᭆ᳛62᥎UḄ2ᳫ¦ᨵ1ᳫḄᭆ᳛*,6ᭆ᳛ᨬᜧḄP᥎UḄ2ᳫ¦ᨵ1ᳫ.ூ:;௃=⚪ὃ@Aᑡ⊤e᪛exᐜᑭᵨᑡ©eᡈ᪛ªeJ«J¬ᙢᑡ©UᡠᨵhiḄjkWU஻⌱Uᔠ\AᡈBḄjkᦪ¯஻WUᭆ᳛."ஹ4"4s20535025²+10024ஹ(1)AF=—717(2)y=----------(00,CE>0ᓽhR¿xḄÞà¢(3)ᑖPA=PDஹAP=ADÃAD=PDACAEAC25Óâã᪷BE=äÁÂḄÃÄᐵÅᑖᑭᵨ½¾¿ᳮᑡEWUxḄᓽh3Mᫀ.xூw2௃(1)᝞¶:A·¸N,3VAB=5,cosB=-,5BᙠRt/\ABNBN-ABcosB=5x—=3,•*-AN=VAB2-BN2=452-32=4

18VBC=x=4,.\CN=BC-BN=4-3=1,ᙠR/AACNAC=^AN2+CN2=y[n>VAD=4,BC=x=4,.*.AD=BC,VAD/IBC,...Ê˪ABC஺ÌÍÊ˪,¢•AB=/D,éZDAE=ZBAC,.,.ÏABC^AADF,.ABAC••=9ADAF.5V17••C=--4AF23xAF=1VT7,(2)VAD/IBC,:.ZDAE=ZAEB,,:/BAC=NDAE,:./BAC=ZAEB,XVZB=ZB,/.ÏABC^AABE,.AEBEAB5ACABBCx'2525ABE=—,CE^—-x=VAD//BC,

19.AFAD4x'~~CE~25-x2'AFAFAE4x5*____=_____._____—"AC~AEAC~25-X2+4XX..25Vx>09CE=------x>0>x:.0

20VAD//BM,AZADB=ZDBC,VZAPD=ZBPE,AZDBC=ZBPE,25ABE=PE=—,x3VcosZABC=—
AB=5,5ABH=3,AH=4,2525AᙠRtAAEH(4+—)2=42+(3--)2,xxঞ᝞îAD=PD=4ï·AH_LBM¸H,DN_LBM¸N,/.ZDAP=ZDPA,VAD//BM,AZDAP=ZAEB,VZAPD=ZBPE,.\ZBPE=ZAEB,25ABP=BE=—,x3VcosZABC=-,AB=5,5.\BH=3,AH=4,VAD//BM,AH±BM,DN±BM,Ê˪AHNDPóª/.DN=AH=4,HN=AD=4,25RtZkBND(4+C)2=42+(4+3)2,xAnzg25yl65+10023xx=------------------,49

21DBHECNMgLp5.Ð.535025Ñ+100®ÓᡠÔJxḄÕR(ᡈ——ᡈ------------2949ூNS௃Ø⚪ὃW./Ḅ®ᔠ1ÙÚ`a┦ÜᦪḄ)ÌஹÝÞßḄឋZஹ¦ῪḄឋZá./Ḅᑨ)XឋZ1ᮣä°ᵨᑖfåæḄçèP⚪ᐵ^.25ஹ(1)y=-2x+200(304xW60)(2)é├ëᓫíR55ᐗï1├ëðñò¥ᨴóᑭ1800ᐗ(3)é├ëᓫíR60ᐗï1├ëðñò¥ᨴó,ᑭôᨬᜧ1ᨬᜧᑭôP1950ᐗ.ூᑖ᪆௃(1)é├ëᓫíR60ᐗï1Ýᙳ¥ᨴ├ëöR80
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10ᐗ20,80ᙳᨴ├(2)ᑭᵨ(-)ᙳᨴ├ᨴ◤⌕!Ḅᐸ$%ᵨ&ᐸ'(1800,)*+ᓽ-(3)ᵫ(2)*+/01-2ᨴ32Ḅᑭ45ᦪᑏᡂ⚔:/;ᔠ5ᦪḄ=>?@B-C2?ᨬᜧᑭ4FḄx@Gᨬᜧᑭ4.ூJ)௃)L(1)ᵫ⚪N2Ly=80+20xSm5ᦪḄᐵP/QLy=-2x+200(30WxW60)(2)ᵫ⚪N2L(x-30)(-2x+200)-450=1800)2xi=55,X2=75(RSᔠ⚪NT)ULV├ᓫQ55ᐗF├XYZ[ᨴ-3ᑭ1800ᐗ.(3)\ᨴ32Ḅᑭ4Qwᐗᵫ⚪N2Lw=(x-30)(-2x+200)-450=-2(x-65)2+2000■:-2<0...VxW65Fw]xḄ^ᜧ_^ᜧ•..30

22c⚪dᔠὃfghi5ᦪஹhᐗki*+ஹki5ᦪᙠm▭o⚪pḄqᵨᐹᨵtuḄdᔠឋ.26ஹV15ூᑖ᪆௃᪷z{|}~Ḅᑨឋᳮᓽ-2ᑮ;.ூJ)௃VZACD=ZABC,ZA=ZA,.,.ACD^>AABC,•AD_AC••=fACABVAB=5,AD=3,"__3___A_C••9AC5AAC2=15,.\AC=V15.ூ:b௃c⚪⌕ὃf{|}~Ḅᑨឋ)⚪Ḅᐵᙠ(ᔜYᑨ*:ᙠ(q1.