天津市东丽区2019-2020学年中考数学五模考试卷含解析

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AP=t,BP=6-t,.*.t(6-t)=2x2,t=2ᡈt=2,AtḄÍ¡2åᡈ2å.ூ2௃Z⚪ὃᙊḄ*ᔠ⚪.21.2V'73ூ᪆௃×⚪ᑖ᪆POOFᚖCD,ö÷OD,ᑭᵨᚖÊíᳮxᑮF¡CDḄ2ᵫAE+EB&ÊABḄÌ»øÄíÉÊOAODḄÌᵫOA-AE&OEḄÌᙠOEFᑭᵨ30஺ᡠùḄ$ú$ḄÉ&OFḄÌᙠODFᑭᵨëìíᳮ&DFḄÌᵫCD=2DFᓽw&CDḄÌ.×⚪᪆P஺OFJ_CD,CD2F,ö÷OD,.♦.F¡CDḄ2ᓽCF=DF,VAE=2,EB=6,.AB=AE+EB=2+6=8,.,.OA=4,.,.OE=OA-AE=4-2=2,ᙠRtAOEFNDEB=30஺.•.OF=:OE=1,ᙠRtAODF,OF=LOD=4,᪷ëìíᳮxDF=ஹ55•55=ஹ73,ὃ2ᚖÊíᳮëìíᳮ.

1622.çÙ*í᪆ூ᪆௃ூᑖ᪆௃ᵫNBAE=NBCE=NACD=90஺?cNDCE=NACB,îNB+NCEA=NCEA+NDEC=18()஺?cZDEC=ZABC,]ïᔠᩩñ?çÙòABC^ADEC.ூL௃VZBAE=ZBCE=ZACD=90°,...N5+N4=N4+N3,.•.Z5=Z3,îNB+NCEA=180°,1N7+NCEA=180°,/.ZB=Z7,'N5=N3ᙠ^ABC0ADEC,8C=CE,ZB=Z7.,.ABC^ADEC(ASA).23.(1)í᪆B(2)m=81,n=85(3)ᶍ.ூ᪆௃ூᑖ᪆௃(DᐜBõÒᦪ᪷8ÅõÒᦪF:?Aõ70WXV80öḄÒᦪ⊡ᐰøä'ᓽ?B(2)᪷8ùᦪḄᓽ?B(3)?úùᦪ0ûḄüᑖ᪆ᔠᳮᓽ?.ூL௃h(1)AஹBÅõýþÒᦪ=5+2+3+22+8=40ÒAõ70

17ூ'(௃*⚪ὃ-.ᩩ012ஹ4ᦪ56ᑭᵨ9ᙳᦪஹᦪஹ";<=>?@AB12CDᨵᵨFGHI⚪ᐵK.24.LM.᪺O᪛Q1RூI᪆௃ᑖ᪆✌ᐜVLM.᪺O᪛QxRᯠX᪷⚪Yᑡ[\ᐗ\^_`[aᫀ.cIVLM.᪺O᪛QxR᪷⚪Y5(+11-1)=6(-1),Ix=LXXaLM.᪺O᪛Q1R.'(*⚪d⌕ὃ-ḄH\ᐗ\^_ḄfᵨghiẠ⚪k.Iqᐵr56sḄtu᪛ḄR᪛vwḄᐵr.25.(1)50(2)cxI᪆y(3)36஺y(4)ᐰ᪥2000}ᐳᣎ6280.ூI᪆௃ூᑖ᪆௃(D᪷ᣎ2*ḄᦪH15ᓰ30%,ᓽ4[ᦪy(2)᪷ᩩ0124[ᣎ4*Ḅᦪ[0ᓽy(3)ᵨ360஺5ᡠᣎH6*Ḅᦪᡠᓰy(4)ᐜ4[(1)ᡠᣎḄ9ᙳᦪ5ᐰ᪥ᦪ2000ᓽ.ூcI௃(1)I•ᣎ2*ḄᦪH15ᓰ30%,...ᦪ15+30%=50y(2)᪷ᩩ012ᣎ4*Ḅᦪ50-(10+15+7+5)=13⊡᝞y(1)ᣎḄᩩ012(3)(1)ᐰᡠᣎH6*Ḅᦪᙠᡧ012ᡠfᡧ0Ḅᙊ360ஹᔁ=36஺.157(4):(1)ᡠᣎḄ9ᙳᦪHy(1x10+2x15+4x13+5x7+6x5)4-50=—,157ᐰ᪥2000}ᐳᣎ20()0x1=6280(*)aᐰ᪥2000}ᐳᣎ6280.

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