山东省济南市平阴县2021-2022学年八年级上学期期末数学试题

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102/OBC=bABC,ZOCB=|ZACB,ᑭᵨDcdḄᑁc}2NBOC=180஺Ó(ZABC+ZOCB)=9O0+1ZA,ᑨঝᵫDcdḄDᩩc)ᑖiÈÉ6:JᑮD·ḄËÌmn:ᓽ2஺ᑮABḄËÌ=OD=m,2SAAEF=SAAOE+SAAOF=1AE«m+|AF«m=|mn,ᑨঞট.13.ூᫀ௃35ூ᪆௃ூ௃-•••A(3,-5)ÕB(a,b)ᐵÉxÐÖ:a=3,b=5.ᦑᫀ,-3,5.ூᑖ᪆௃ᐵÉXÐÖḄᙶ᪗ᱯØ-ᙶ᪗mk:Ùᙶ᪗f,mÚᦪ:ᓽ.14.ூᫀ௃80°ூ᪆௃ூ௃-᪷Dcdᑁc}NᳮG.ZC=18O°-ZA-ZB=8O°.ᦑᫀ,-80°ூᑖ᪆௃ᵫDcdᑁc}Nᳮᓽ02CḄÛᦪ.15.ூᫀ௃y=2x-3ூ᪆௃ூ௃-68ᦪḄ᪆T,y=kx+b,•.•68ᦪḄÃ)jÉbiy=2x+5,/.k=2,•.•68ᦪḄÃÁÂ(0,-3),.'.b=-3,...68ᦪ⊤ÜT,y=2x-3.ᦑᫀ,-y=2x-3.ூᑖ᪆௃ᵫÉ“i)j:kmk“:ᑭᵨÞN´ᦪ1068ᦪ᪆Tᓽ.16.ூᫀ௃(-4,2)ூ᪆௃ூ௃-..•ßGᐵÉxஹyḄHᐗ689xḄàáâ:...68ᦪy=ax+b}y=kxḄÃãÈᙶ᪗,(64,2).ᦑᫀ,(—4,2).

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14ᙶ᪗ᓽPḄᙶ᪗.23.ூᫀ௃(1)10%*(2)5*6ব!300()x(25%+10%+5%)=3000x40%=1200(¢).ᦑ”¤¥¦§¨7ᜩ”Ḅª«ᨵ1200¢.ூ᪆௃ூ௃!(l)a=l-(40%+20%+25%+5%)=1-90%=10%,®¯Ḅª«¢ᦪ!24040%=600¢,8ᜩḄ¢ᦪ!600x10%=60A,(2)°B±²³´¤¥5ᜩḄ¢ᦪᨬµ,ᡠ¶·ᦪ5ᜩ,600¢¸ᢥ᯿°B±²³´¤¥Ḅᜩᦪ»¨ᑮµ᣸ᑡ¿300¢301¢À6ᜩᡠ¶¸ᦪ6ᜩ.ᦑᫀ\!5,6*ூᑖ᪆௃(1)ᡧxÂ@~¸ᔜÄᑖÅᑖÆÇÈ1,zaÉᓽ+ᑭᵨ“5ᜩ”Ḅ¢ᦪ◀¶ᐸÅᑖÆᓽ®¯Ḅª«¢ᦪ˶a,ᓽ“8ᜩ”Ḅ¢ᦪᯠ⊡~ᓽ;(2)᪷·ᦪஹ¸ᦪḄÍᓽ;(3)ᑭᵨ᪵ϸ“¤¥¦§¨7ᜩ”Ḅª«¢ᦪÅᑖÆ˶30()()ᓽ.24.ூᫀ௃(1)!ÑÒÓᵬÕÖ×ḄᑭØ\xᐗÒÓÙÕÖ×ḄᑭØ\yᐗ,2y=30ᵫ⚪Û:y=13x=4:.y52!ÒÓᵬÕÖ×ḄᑭØ\4ᐗÒÓÙÕÖ×ḄᑭØ\5ᐗ;(2)!ᵫ⚪Û,w=4a+5(40-a)=-a+200,

15/.WÝaḄßᜧàC•••a>20âa\᦮ᦪ...äa=21wæᨬᜧÉ,zw=179,ᵫçᦻᐹêᡠëᑭwaḄìᦪᐵ#\í=î+200,äa>20wḄᨬᜧÉ179.ூ᪆௃ூᑖ᪆௃(1)ÑÒÓᵬÕÖ×ḄᑭØ\xᐗÒÓÙÕÖ×ḄᑭØ\yᐗ᪷⚪ÛᑡHZ[ïð;3ñᓽ+(2)᪷⚪Ûᑡìᦪ᪆#w=4a+5(40-a)=-a+200,ᑭᵨ4ìᦪḄឋuᓽ஺25.ூᫀ௃(1)V7-V6(2)Vn+1—y/n11111ব!rp2+7T+75+7I+7Z+---+V98+V99+V99+V100=V2-1+V3-V2+V4-V3+•••+V99-V98+V100-V99=V100-1=10-1=9.ூ᪆“௃!পõ=("ö÷ø3᜛-ᦑᫀ\!A/7—V6;(2)7n+l+Vn=(ù+i+vû)(ù+Jvý)=-þᦑᫀ\!'Jn+1-Vn+ூᑖ᪆௃(1)᪷⚪ÿḄ⚪ᑖᑖ-ᓽᓄ(2)᪷⚪Ḅ⚪ᑖᑖ┑-ᓽᓄ(3)ᐜ!"#$ᑖᨵᳮᓄᯠ()*+,ᓽ.26.ூ0ᫀ௃(1)0.5(2)789:;DE>?Ḅ@ᦪ7᪆"Cy=kx+b(2.5?Ḅ@ᦪ7᪆"C:y=110x-195(2.5?Ḅ@ᦪ7᪆"Cy=mx(0

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18••Pᙠ:;CDo,•••x=—^(µ¶)x=4mC©ᔠ(µ¶)••ᙠMP2¸4cBpC¹Ὺ¤»¼PMḄᙶ᪗(0,3)ᡈ(|´).ூᑖ᪆௃প:y=x+l,~hy=()m-x=-l,SBḄᙶ᪗ᵫ±=¾+3~hx=0my=3,y=0mx=4,ᓽSCஹDḄᙶ᪗(2)ᵫyMMᙠ:y=x+loSM(x,x+1)"kMMN_LxyN,জMᙠxḄomঝMᙠxḄm᪷S=2BC-MNᑖÀ~hSxḄ@ᦪᐵ|"ᯠ(s=10ᑖÀQᐭ7᪆"~hxᓽSMᙶ᪗(3)ᑖ¤¥¦§8জCB=CPmঝ8P=PCmঞBC=BPm¨ᑖÀ~7ᓽ.

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