2021-2022学年昆明市中考五模数学试题含解析及点睛

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17.
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⊤0.056=5.6x1()2,ᦑ⌱8ஹBூ
᪆௃⚪ᑖ᪆᪷ᭆ᳛Ḅ
জᐰḄ!ᦪ"ঝ$ᔠᩩ'Ḅᦪ(")ὅḄ+,-.ᐸ012Ḅᭆ᳛.3450,-1,-2,1,36789:;<8ᑮ>ᦪḄᭆ᳛.ᦑ⌱B.ὃᭆ᳛.9ஹBூ
᪆௃⚪ᑖ᪆⌕ABḄCDEᯠ◤⌕ᑖHIᑮJKLMLN6OᵨQRSᳮUACVCEḄWᓽ.YᙠRtAACB6AC2=AB2-BC2=2.52-1.52=1,.AC=2,VBD=0.9,.*.CD=2.1.ᙠRtAECD6EC2=ED2-CD2=2.52-2.1M.19,/.EC=0.7,)AE=AC-EC=2-0.7=1.2.ᦑ⌱B.ὃQRSᳮḄ\ᵨ.10ஹCூ
᪆௃ᑖ᪆᝞^_WAB`CFaE,

8VZACB=90°,NA=30°,.,.ZABC=60°.VZl=35°,:.NAEC=NABC-Nl=25°.VGH/7EF,/.Z2=ZAEC=25°.ᦑ⌱C.)ஹbc⚪(eᜧ⚪ᐳ6Jh⚪ih⚪3ᑖᐳ18ᑖ)11ஹঠூ
᪆௃জᑭᵨmLḄnLo᧕NEAB=NPAD,pqᔠrsᩩ'ᑭᵨSAStMLNᐰ"ঝu8v8/

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1142ᑮᑁḄᩩḄᭆ᳛:=,632ᦑᫀூ!"௃$⚪ὃ'(ᓫ*+Ḅᭆ᳛Ḅ,-./*+Ḅᭆ᳛,-012⚪Ḅᐵ4.15ஹ6ூ2᪆௃89:ᡧ<Ḅ=>?᪷A⚪BCDᦑᫀ6.16ஹ—3x(x—1)ூ2᪆௃E1FG0H1ᓽCDᑮJK.ூL2௃2E1=-3x(x-1),ᦑᫀ-3x(x-1)ூ!"௃$⚪ὃ'MH1ᑖ2-F0H1PQR./FG0H1ḄSP2T⚪Ḅᐵ4.Uஹ2⚪(ᐳ8⚪ᐳ72ᑖ)17ஹ(1)ᵬ80+Y20+Z(2)x<90ூ2᪆௃(1)ᵬ[ᝄ]^_Mx+Y[ᝄ]^_M(100-x)+ᑭᵨᐳᵨ2800ᐗᑡdSefg2ᓽCZ(2)8ᵬ[ᝄ]^_Mx+Y[ᝄ]^_M(100-x)+᪷A^_9ᢇᝄ]Ḅijᵨklm2900ᐗᑡkn1g2ᓽC.ூL2௃2(1)8ᵬ[ᝄ]^_Mx+Y[ᝄ]^_M(100-x)+᪷A⚪BD30x+20(100-x)=2800,2Dx=80,ᑣ100-x=20,ᵬ[ᝄ]^_M80+Y[ᝄ]^_M20+Z

12(2)ᵬᝄx'ᝄ(100-x)'᪷⚪U30x+20(100-x)<2900,YUx<90,ூ௃e⚪⌕ὃ9ᐗ9¢£¤9ᐗ9¢¥¦Ḅ\ᵨ᪷rsᩩ'§ᑡ£¤¥¦.Y⚪Ḅᐵª.18ஹ(1)y=x2-4x+3(2)(2,9)ᡈ(2,7)ᡈ(2,-1+2¬)ᡈ(2,-1-2)"(3)Eᙶ᪗(_,—)2''24³ACBEḄ☢ᨬᜧ.ூY᪆௃⚪ᑖ᪆(1)ᵫKwY᪆¦UBஹCᙶ᪗ᑭᵨ¶S·ᦪ
U¸ᱥwY᪆¦"(2)ᵫ¸ᱥwY᪆¦UPᙶ᪗º»¼½Mᙶ᪗⊤MCஹMPVPCḄWᑖMC=MPஹMC=PCVMP=PCMᑖHUᑮᐵaMᙶ᪗Ḅ£UMḄᙶ᪗"(3)uEvEFLx½`KwBCaF,`x½aD,Eᙶ᪗⊤FḄᙶ᪗⊤EFḄW,¾9¿⊤ACBEḄ☢ᑭᵨ)¢ÀᦪḄឋ~UᐸÁUᨬᜧ,³EḄᙶ᪗.⚪Y᪆(1),Kwy=-X+3¤x½ஹy½ᑖH`aBஹC,AB(3,0),C(0,3),ÂBஹCᙶ᪗Ãᐭ¸ᱥwY᪆¦U4.YUÅC=3(c=3...¸ᱥwY᪆¦y=x2-4x+3(2)Vy=x2-4x+3=(x-2)2-1,)¸ᱥw»¼½x=2,P(2,-1),M(2,t),ÆC(0,3),•••MC=&+(f-3?=J9+13MP=|t+l|,PC=&2+(-IT)?=26VACPMῪMLN...ᨵMC=MPஹMC=PCVMP=PCM,____________33জÈMC=MP³ᑣᨵh-6f+13Ë+1|YUt=94³M(2,-)"22ঝÈMC=PC³ᑣᨵ▭X2ÎYUt=-l(¤PÏᔠÐ)ᡈt=7,4³M(2,7)ঞÈMP=PC³ÑÒJᨵ|t+l|=2ÓYUt=-1+26ᡈt=-1-2Î4³M(2,-1+2Ó)ᡈ(2,-1-2^)

13pqCrsᙠuvᩩ+Ḅ!M,ᐸᙶ᪗2,|
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⚔!Dᙶ᪗(1,4)(2)জ}MG_Lx~G,±²BM.ᑣNMGB=90஺8M(m,-m2+2m+3),,MG|-M+2/஻+3|.*.tanZMBA=V´=J____________LBG3-mDE_Lx~D(1,4),AZDEB=90°,DE=4,OE=LVB(3,0),.♦.BE=2,,BE1.*.tanZBDE=——=-,DE2•:NMBA=NBDE,|-7n2+2/n+3|_13-m2-m2+2m+3!Mᙠx~qS,3-m22Dm=-!ᡈ3¶·,2!Mᙠx~¸S=-3-m22Dm=-;ᡈm=3¶·239

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