2021-2022学年宁夏省中考数学猜题卷含解析及点睛

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2,1,A*=2x1=2.ᦑ⌱B.

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•AN=A'N'VZAMN=40°,ÿNA'ON=80°,ZBON=40°,.,.ZA,OB=120°,
஺OQ_LABQ,ᙠRtAASQ,OA=2,.*.A,B=2A,Q=2>/3ᓽPA+PBḄᨬ2G.ூ௃⚪ὃᨬ⚪᪷"Ḅឋ$%&'(⚪Ḅ⚪ᐵ*.13ஹy=3x-lூ᪆௃Vy=3x+1Ḅ"ÛyᔣÝ\]2ᓫ.••\]{ᡠu"Ḅᦪᐵs`y=3x+l-2,ᓽy=3x-Lᦑᫀ`y=3x-1.14ஹy(x++2y)(x-2y)ூ᪆௃✌ᐜ0123y,4ᑭᵨ789:;ᑖᓽ=.ூ>௃?3=y(x2-4y2)=y(x-2y)(x+2y).ᦑBᫀ(Dy(x+2y)(x-2y).

11ூ
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௃⚪ὃE}Ḅy8z{Ḅy8~Y|Fᑣ(B⚪Ḅᐵ*.ஹB⚪(ᐳ8⚪ᐳ72ᑖ)17ஹ(1)᪆(2)r=.2ூ᪆௃(1)ZOD,ᵫOD=OB,ᑭᵨᑮPi4ᵫqiᣚᑮN1=N3,N4k90஺ᓽ=(2)ᙊḄkr,ᑭᵨ┦[ᦪABḄg4ᑭᵨᳮᑡᐵrḄ88Ḅᓽ=ᑮU.ூ௃(1)DZ00,

121o•OB=OD,
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A,B©ᜐ«¬?ᨵ®«ᑖ¯(270,1ᔴß2
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13(2)ᑖtAᜐBᜐâãCᜐḄäåæᐸèéᩭ-200ᔴ¢ìᓽ¼Be(3)ᵫ⚪Awᵫvwu)ABC1NA=26o/ACB=90஺íAB=lKm,sin/BAC=——⌕tBCḄGᵨAB;<ᦪ<;<=.ூ௃(1)îA,BRᜐäï»ᨵðäx,yᔴx+y=450᪷W⚪Au<ux=270,y=l.A,BRᜐäï»ᨵðäᑖb270,1ᔴ.3(2)AäïâãCäïḄäåbòx270=162(ᔴ)2BäïâãCäïḄäåblxl=72(ᔴ)A,BRäïᔠóᐳâãCäïäå`162+72=234(ᔴ).V234>200,...7ôõö÷øCäï◤t.᪷W⚪AwNA=26஺AB=1ᓟûZACB=90°.ᙠRtAABC1sinNBAC=—,AB
.BC=AB»sinZBAC=1x0.44=79.2.•7üᨬþ¹ÿ4x35=140(ᓟ)<2x79.2,...⌶ᐰᑮBᙢ.ூ௃ḄᡈḄ⚪!"#$%ᓄ'()Ḅ⚪*(+Ḅ,-./01.19ஹ(1)34(᪆6(2)1+72ூ᪆௃(1)780஺*:ᔠᑗ1Ḅឋ>?)@ᡠBḄᙊᕜឋ>*ᑭᵨGHIᣚ((2)᪷LMNOᳮᐜOC,RAC.

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