江苏省苏州市张家港市2021-2022学年中考数学猜题卷含解析及点睛

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15(1)ᵫ᳘ᳮZA=60°,AC=20V6;ᦑᫀ60஺20^/6;(2)᝞:⚪BC=4()x0.5=20().VCD/7BE,.•.ZDCB+ZCBE=180°.VZDCB=30°,.,.ZCBE=150°.VZABE=75°,.,.ZABC=75°,.*.ZA=45°.“…ABBCᙠABC9---------=-----9sinNACBsinAABBCᓽjr=19sinZ60°sin45°AB=1076^24.49().!"$%AḄ$'AB(24.49.ூ*+௃-⚪ὃ/01ᔣ3Ḅ4567⌕Ḅ9ὃ/0:;<Ḅ▅>ᳮ?@ABᩞᧇEFG;H

16ᙠ4ADF4DECVZAFD=ZC,ZADF=ZDEC,/.{ADF^ADEC(2),••wxgABCD9yzwxg.*.CD=AB=1.ᵫ(1)4}ADFs^DEC,.ADAF••=9DECD.ADCD673x8..AF4GᙠRtAADEᵫstᳮAE=VDE2-AD2=Jl22r=623ஹ(1)y=-^x2+4p(2)2

17...ᱥlCḄ¶ᦪ⊤¸¹=-p/+4.17(2)ᵫ⚪ᱥl஺Ḅ⚔*ᙶ᪗(2-4),ᱥl஺Ḅ᪆y=Q(x-2m)~-4,12,y=——ᔆ+42ᵫ[2y=—-4yÂ!)/2஻a+2m28=0,(-2/«)2-4(2???2-8)>0ᵫ⚪ᱥl஺ᱥlCᙠyḄᨵae:Ḅᐳ*ᑣᨵ>02Ê2—8>02

18õöᡠø஻=6ᡈ"?=JF7-1wxgPMP'N91g.24ஹ(l)390,L5x,y=-5x+l(300SxW2);(2)úûü320ᐗᑭþᨬᜧ
3ᐗ.ூ᪆௃(1)᪷⚪ᩩ390,l-5x,├10ᐗ
ᨴ├50ᓟ
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5ᳮ├ᖪᨴ⌕8ᡂ024504Ḅ├ᓽ;xḄ<=.(2)ᵨx⊤@y,ᯠBCᵨxᩭ⊤@w,᪷ᦪᐵ!"
ᓽ;ᨬᜧw.ூ௃(1)F⚪GH,400-xy=200+50x———.ᓄIHy=-5x+l.ফF⚪GᨵH.Jx>300,[-5%+2200>450>L300