2022-2023学年安徽池州市东至县数学八年级上册期末调研模拟试题含解析

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2022-2023
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14XᓝFᨵ67,x—2.x+1X.•.xAH;0I1J᜜ḄLMᦪ,Ox=2=-^~^=-1ூST௃U⚪ὃWᑖḄ)*Fᓄ0?<XYZ[ᑖḄ\ᔠ(ᑣ⚪ᐵ^6ᑖᨵ67ᑖ_`a0,bF◚dᩩ9.20ஹ(1)AD=BE.(2)ᡂfg᪆h(3)ZAPE=60°.ூᑖ᪆௃(1)ijᑏᫀᓽA.(2)mnECBgZiiACDᓽA.(3)ᵫ(2)1ᑮNCEB=NCAD,qa⚪Ḅᐵឋ3stuᑁvIwᳮᓽAy
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16J:SJBC=3X4——x2x3——x2x4——x1x2=4ফ᝞IᡠU6(-6,0)ஹg(10,0)ஹᔧ(0,5)ஹ1(0,-3).3ூᑖ᪆௃ᐜw_ᑖ)ᑖᓄᐗ)bᓽO.ூb௃bUᑖ})4-(x+l)(x+2)=-(x+l)(x-l),¡᦮ᳮ})4-x2-3x-2=-x2+bᓽ3x=l,b}x=,11QU¤¥=¦)%2-1=--1=--^0,399§Ḅbx=.ூT¨௃

17U⚪ὃWᑖZ[ᑖḄ?(⚪Ḅᐵ^6Fw⌕᪷.23ஹ(1)A>BᐹᝅḄᑖ25I20ᐗh(2)஺=-5஺+1100,(20<«<30)4ঝ45ᝅBᐹᡠ◤ᵨᨬḕᡠ◤ᵨa900ᐗ.ூ᪆௃(1)AḄᐹaxᐗBḄᐹayᐗ᪷1ᝅAᐹI1ᝅBᐹḄa45ᐗ2ᝅAᐹI5ᝅBᐹḄa15()ᐗᑡ¡ᐗF¢£ᓽAh(2)জ᪷¥¦=AᐹḄᵨ+BᐹḄᵨᑡ§ᦪᐵ¨ᓽAhঝᑖ©ª«¬®ᓽA¯F©ªzᵫ§ᦪᐵ¨A°a=30¦±²ᨬ³◤⌕ᵨ950ᐗh¯¡©ªz45ᝅBᐹ◤⌕900ᐗ.ூB௃z(1)AḄᐹaxᐗBḄᐹayᐗ᪷⚪6ᨵx+y=45(x=25A஺JA1´=20,2x+5y=ᡠHAஹBᐹᝅḄᑖ25I20ᐗh(2)জµa20

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19:.S;ARC=~xABxAC=´xADxBCZAA6c22:.—x3x4=—x5xAD22b}AO=?(3)•••/B=45஺)ABAC^90°NC=NB=45°µABCFWῪ·YXYZVADLBC...ADᚖ·¹ᑖBC,NB=NBAD=45஺7.CD=BD=AD=4,4.BC=CD+BD=8S,=—xBCxAD=—x8x4=16•ABRCC22ூT¨௃º⚪ὃ»¼XYZḄ½ᔠ¾⚪)¿ÀYḄÁYÂWஹÃÄ\ᳮÅXYZḄ☢ÇÈFb⚪ḄᐵÊ.26ஹNAB£=38°.ூᑖ᪆௃᪷oWῪXYZḄឋ^}/R4E=52°,Ë᪷o·YXYZḄឋ^)ᓽO}ᑮÍᫀ.ூb௃•••AB=AC,ADA.BC,NC4D=26°,AN84E=2NC4Z>=52஺)'4BEYAC,ZAEB=90°,AZABE=90°-52°=38°.ூT¨௃º⚪Ï⌕ὃ»WῪXYZḄឋ^Å·YXYZḄឋ^\ᳮ,¿ÀWῪXYZ“XÑᔠ”Fb⚪ḄᐵÊ.