2021-2022学年安徽省滁州市定远县张桥片八年级（下）期末数学试卷（附答案详解）

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2021-2022
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12(V2-1+V3-V2+V4-V3+-+V2021-V2020)x(V2021+1)=(V2021-1)x(V2021+1)=2021-1=2020.(1)᪷m⚪¬OḄ®y¯⚪¬OḄw®ᑖ°ᨵᳮᓄ²(2)᪷m(1)OḄ8³y¯ᡠ\w®ᐜᓄᯠᔠ·¸/0᪷w4᪷mj¹ºwᓽ.:⚪ὃᵨ.18.ூᫀ௃1640ூ᪆௃(l)a=200X8%=16,b=200x20%=40,ᦑᫀ16,40²70ফn=360x^=126²(3)200-16-40-200X25%-70=24(¼)1200x¾=144(¼)E¿ᨵ24¼ÀᐰÁÂAᝄḄ¼ᦪE144¼.(1)ᑖuᵨ¼ᦪ~y4ஹBAÅ|>ÆᑖÇᓽ*aஹbḄ3²(2)ᵨ360~y஺¿¼ᦪᓰÉÊ<¼ᦪḄÇᓽ²(3)᪷mᔜᑖ¿¼ᦪÌNA,ÉÊ<¼ᦪ\ᓽE¿¼ᦪ²ᵨ¼ᦪ~y᪵:OÎ,91ᑖḄ¼ᦪᡠᓰÇᓽ.q⚪ὃ<ḄEÏ⚣ᦪᑖÑevḄÒLNᑭᵨÓvÂ5ÔÕḄÒL.ᑭᵨÓvÂ5ÔÕÖ×ØÙÚஹᑖ᪆ஹẆÜÓvÝÒÞ*7CḄᑨßNàá⚪.19.ூᫀ௃vABD=120°,ND=30°,^AED=120°-30°=90°,ᙠRtABDE4,BD=400m,Z.D=30°,BE=-BD=200m,2DE=yjBD2-BE2=200V3x346(m).âi᢬äEå஺346m,7æç4C,EPäᙠeè.

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ᙳ᳛10%;2᪷⚪2020
ᢗᐭ2000x1+10%=2200ᐗ⚜ᑮ2022
ᢗᐭ2420x1+10%=2662ᐗᡠ"#ᡂᩩ⍝'ᦋ⌼*+Ḅ,ᢗᐭ2000+2200+2420+2662=9282ᐗ.ூ᪆௃1᪷“2019
ᢗᐭ2000ᐗ2021
ᢗᐭḄ2420ᐗ0
1
ᢗᐭḄ
ᙳ᳛23”ᑮ25Ḅ6ᐗ789+:;ᫀ=2᪷⚪;":ᑮ2022
Ḅᢗᐭᯠ?@2019ஹ2020ஹ2021ஹ2022
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15••e40Fwz\C0E(44S),.OE=OF=(2)[\]4ECFf].XY஺`UACḄa`•0A=0C,vOE=OF,[\]4ECF^[\]•ACEF,•[\]4ECFUf].ூ᪆௃(1)hᔠ^[\]ḄឋkᑭᵨA4sXYeAOF^LCOE;Xhm=(2)ᑭᵨnopq2ᑖ;XY[\]sECFU^[\]hᔠnopq2ᚖu;XY[\]4ECFUf].D⚪v⌕ὃF^[\]Ḅឋkxᑨzf]ḄᑨzᐰM|o]ḄᑨzxឋkXYe40FWACOEU⚪ḄᐵV.23.ூᫀ௃XY(1)}4஺=஺஺OE=OF,AAOE=ACOF:4AOEXCOF(SAS),Z.OAE=Z.OCF•.AD//BC,EDO=Z.FBOOE=OF,Z.EOD=FOB5.^EOD^^FOB(AAS),OB=OD,04=OC[\]ABC஺U^[\](2)•••EFLAC,AO=CO,5.AF=FC•••AB+BF+AF=AB+BF+FC=15ᓽ4B+BC=15.••0/IBC஺Ḅᕜ=2(4B+BC)=15x2=30ூ᪆௃(1)ᵫ“SAS”;XAAOE|ACOF,;Z/ME=40CF,ᵫ“A4S”;XeE஺஺|eFOB(AAS),;08=஺஺ᓽ;X[\]4BCDU^[\]=(2)ᵫpaᚖpḄឋk;AF=4E,;4B+BF+4F=48+BC=15,ᓽ;[16⚓ᐳ17⚓

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