人教版 八（上）全册教案

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74(3)fx=2.5jy=3X2.5=7.5.'5UVAஹB|ᙢ~30ᓟBஹC|ᙢ~48ᓟ.PAj12ᓟḄAᙢH./2ᙢᑮCᙢ.BPjx(j)8ᙢ)(ᓟ).(1)fᓃPᙠ4ஹB|ᙢjXydxḄᦪᐵxY.(2)fBPᙠBஹC|ᙢjXydxḄᦪᐵxḄY.ᑖ᪆(1)fBPᙠAஹ8|ᙢj8ᙢ)Aஹ8|ᙢḄdPᡠḄḄ..ߟ-----------------------¡30ᓟ48ᓟ(2)fBPᙠ8ஹC|ᙢj8ᙢyPᡠḄdAஹB|ᙢḄḄ.y♦——*AA-\--------------------B-\-----------------_-__-----------------,C30ᓟ¦ᓟ,(l)y=30-12x.(04W2.5)(2)y=12x-30.(2.5

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77QP.:____________________________k9-ᦪb᪵kQ᪵5ᨵᐳP.+___________________________QP.+___________________________ᙠPq☢sᙶ᪗vX4H1HᑡᦪḄ(l)y=2xRy=2x+3(2)y=2x+lRy=^x+1wPx4;yyᔲRz☢Ḅde{|᪵.m.⚪R}~1(1)ᦪy=-2x+5Ḅ(2)ᙠᡠḄz8,-.xḄᙶ᪗^ᙶ᪗xᔲᐵvy=-2x+5oᑡ⊤:X-2-1012…y=2x+5…97531….+0⊤XᔜK_!.Ḅᙶ᪗ᙠsᙶ᪗ᑁḄ.஺+Y.ᩭᑮy=-2x+5Ḅᩩ஺᝞H+ᙠz.A(3,-DB(4,-3),kx=35y=-2X3+5=-lTkx=45,y=-2X4+5=-3»(3,-1),(4,-3)ᐵvy=-2x+5஺(1)ᐵvy=-2x+5ḄxஹyᡠKḄ.(x,y)ᙠᦪy=-2x+5Ḅzᔩ3(2)•ᦪy=-2x+5ḄzḄ.(x,y)ᐵvy=-2x+5ᔩ3ᑖdeᯠ;¡஺(1)ᐵvy=-2x+5Ḅx,yᡠKḄ.(x,y)ᙠᦪy=-2x+5Ḅz஺(2)ᦪy=-2x+5ḄzḄ.(x,y)ᐵvy=-2x+5஺ᵫ£yᩭᦪᐵvy=-2x+5Ḅx,yᡠKḄ.(x,y)ᙠᦪy=-2x+5ḄzT¤(ᩭᦪy=-2x+5ḄzḄ.(x,y)ᐵvy=-2x+5஺ᡠ0ᦪḄ¥ᦪ⊤¦RKḄᓽ•ᦪḄ¥ᦪ⊤¦Ḅ.ᙠᓃzḄ¨.Ḅᙶ᪗x,ᙶ᪗yᦪḄ¥ᦪ⊤¦஺

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kr0Ḅឋã.2.U᪷ìkRhḄ_íᦪḄᨵᐵឋã.ᦟî.L-ᦪXkRbḄ_KᦪឋãḄbcT2.{ᔠðñᦪᨌbḄ8_^`aḄᐵvóôᦪÝ{ᔠUõ.ᦟö.ᦪᨌ஺Ḅ8_^`aḄᐵvᦪÝ{ᔠUõᦟ(÷I.ó)⚪øù½᛻1.ᦪḄᩩ¼½¾Hᡃx4ᦪḄ8ᕸ9-.&Gº»322.ᙠPsᙶ᪗vX4ᦪy=§x+l^y=3x-2Ḅ.

80)ᙠᡠ4ḄᦪX'(,-▲.II.þᐭ
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0_0ᡠOb>0/Zx[Ḅ\ᙠy[Ḅ`a[3bᙠx[Ḅcdb<0/Zx[Ḅ\ᙠy[Ḅea[3bᙠx[Ḅfc.ᡠOk>0,b#0/ஹஹg▲ᡈஹஹi▲.33.ᙠjᙶ᪗klᦪy=-x+2my=Ḅ'ᶍ0.᪷p☢ᑖ᪆ḄrẆtCIᦪ@ᔲ3ᨵuvḄឋxEyz{|}.3ᦪ0=-x+2my=Ḅ:ᙠ!ᔣ#$%/'ᓽ)*+x,ᑮᜧ/0Ḅ12⌲57ᑮ6*ᓄ'ᦪyḄ93ᜧ*ᑮ,0.ᓽ:ᦪ9y;)*+xḄ<ᜧ=~,.

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83¼(1)ãᙶ᪗@2Ḅ@A(2,-l)d(2)äᙶ᪗@-3ḄB(3,-3)d(3)ᑮy[å¥æY1ḄC(l,l)m஺(-1,5).5lᦪ)=-2x+2Ḅìᔠîïfᑡ⚪:(1)Cᦪ;ḼxḄ<ᜧ)ð<ᜧñ@~,EJḄ!ᑮ#ò᪵*ᓄ?(2)xÅÏ9/y=0?(3)xÅÏ9/y>0?ᑖ᪆(1)ᵫYk=-2V0,y;ḼxḄ<ᜧ=~,.(2))=0,ᓽäᙶ᪗¾0Ḅ,ᡠOCᙠx[.(3))>0,ᓽäᙶ᪗¾`ḄCõᙠX[Ḅc.¼(1)ᵫY4=-2<0,ᡠO;ḼxḄ<ᜧyð~,.ᙠ!ᔣ#$%/.Ḅ123ᙠ⌲57ᑮ6*ᓄᓽ!ᑮ#ᕈføù.

84(2)x=l/,y=0.(3)xVl/,y>0.IV.
/,ì1.(1)ú>0/y;xḄ<ᜧ=<ᜧC/ᦪḄ!ᑮ#ᓣd(2)A<0/y;xḄ<ᜧ=~,C/ᦪḄ!ᑮ#f.6>0,Z)[\Y`a[d6<0/Zy[\Yea[d6=0/Zy[\Yᙶ᪗û.2.>0_>0/ஹgஹ▲dk>0_<0/ஹஹi▲d%<0_>0/ஹஹgஹi▲dk<0_<0/gஹஹi▲.V.
üýþ1.±²ᦪy=(ᵨ-+஻?,mᦪᦪ.ஹஹ▲2.!"ᐵ$xḄᦪ>,=(-2/n+l)x+2/n2+w-3.(1)&ᦪ'()ᦪஹ▲*”Ḅ,(2)&ᦪḄ-(1,-2),*mḄ.23.!"ᦪy--.(1)./y0xḄ1ᜧ31ᜧ(2)4/y0xḄ1ᜧ3564.!"-(-1,4)8“:ᙠ<=y=gx+3>?(@஺8BḄᜧ6.CDEFGHᑨJḄBK5.LᦪḄMNᜧO᝞QᡠS?ᑖUVWX஺ḄYZ[FᦪḄឋ].

85^⚪`ᦪaᵨ()ᦟ᪗1.ᳮefWgᦪK,2.DᵨfWgᦪK*ᦪᵨᦪ⊤ijekᨵᐵmno⚪.3ஹpqᵨ“ᦪrsᔠ”uEekᦪvo⚪.ᦟfWgᦪKVWwᦪe᪆jᦟI,yFo⚪z{|᛻ᦪᐵgjy=h+b(kWO),᝞~"⍝ᓃḄᦪe᪆jVWᨵ᪵ḄᩩD*Hl48bᕖo⚪1!"ᦪx=-2ᦪ=/,=3y=-3.DᔲᑏFᦪḄe᪆jᕖ᪷ᦪḄW{ᦪ:y=h+b(AHO),o⚪s᝞*FkbḄ.ᵫ!"ᩩx=-2y--1,-1--2kb.ᵫ!"ᩩx=3y=-3,-3=3k+b.ᩩ:⌕¡ᓽeᐵ$xḄᐗB¤2k=-—1=—2k+h,5e■-3=3k+b.9h=—5

8629ᡠᦪe᪆jy=o⚪2!"©ªḄ«¬y(ᔖ®)ᙠWḄ▲¬ᑁᡠᢞᱥ]x(ᓟ´)Ḅᦪ.m!µ¶ᢞ·ᱥ©ªḄ«¬6ᔖ®ᢞ4ᓟ´]Ḅ·ᱥ©ªḄ«¬7.2ᔖ®*ᦪḄᐵgj.ὃ⇋o⚪½Ḅ¶ᢞᱥp©ªḄ«¬6ᔖ®8ᢞ4ᓟ´]Ḅ·ᱥ©ªḄ«¬7.2ᔖ®,ᦪᐵgj½Ḅxஹyᨵ¾ᐵgII.ÀᐭÂÃ>⚪Ä᝞Qᑖ᪆`!"yxḄᦪᐵgjᦪᑣᐵgjÆ)=Ç+8Ḅrjᡠ⌕*Ḅgᦪk8ᓃḄ.3!"ᩩx8yḄÊËaÌx=0ஹy=6,x=4y=7.2.ᑖUÎÏÐÑᐭᦪjÒᓄ*kbḄᐗB¤ÊÕ3*஺Ḅ.e{ᡠ*ᦪḄᐵgjy=Ax+b/#O),ᵫ⚪Ù[6-b,7.2=4k+b.eB¤Êk=0.3,b-6.ᡠᡠ*ᦪḄᐵgjy=0.3x+6.(ᐸ½ᨵWḄÝ)Þß1.á⚪½âËᦪÑᐭe᪆jã*ek8ᓃḄ¤Òᓄᐵ$k8bḄᐗB¤ÊḄo⚪.2.o⚪n▭o⚪ᨵᐵḄᦪååᨵWḄÝ.o⚪3&,ᦪy=mx-(m-2)-(0,3),*4Ḅ.ᑖ᪆ὃ⇋ᑮ<=)=.x-(஻*2)-(0,3),[é-(0,3)ᙠ<=>êëᯠ!"ᩩ½íᨵ<îïFx8yḄËaðᵫ$>ñ-Ḅᙶ᪗(x,y)Ñ⊤ᦪḄËËaÏḄôᙶ᪗x⊤SḄL•öᙶ᪗y⊤SÏËaḄᦪ.ᡠ÷⚪Òᓄ!"x=0y=3,*ø.ᓽ*ᐵ$ùḄᐗB¤.ex=0y—3.ᓽ`3=-(.-2).e.=-1.Hᐜ{f*ᦪᐵgj(ᐸ½ûᨵü"Ḅýᦪgᦪ)þ᪷ᩩᑡ
ᡈ
,

87ᦪᑮᡠḄ
ᦪm.⚪1"#$%ᦪ)=(+*Ḅ+,-./(3,5)3/(-4,-9),78=59%ᦪyḄ;.ᑖ᪆1.+,-./(3,5)3/(-4,-9),ᓽ"7x=39y—5Vx="49y=-9.Aᐭ%ᦪC᪆DEkb.2.Iᯠ⚪KLMᨵ⌕ᑏ%ᦪḄᐵDRST⌕x=59%ᦪyḄ;U◤%ᦪC᪆DḼX.3k+b=5Cᵫ⚪K-4k+b--9k=2CZ[
\b=-lZ[%ᦪC᪆DTy=2x-l7x=59y=2X5-l=9.2"_%ᦪḄ+,᝞a+ᑏbḄᐵD.ᑖ᪆“d”f+,-.xghiᙶ᪗T2Ḅ/yghlᙶ᪗m-3Ḅ/.“ᦪ”f,ᙶ᪗(2,0),(0,-3)opC᪆D.CqrᡠḄ#$%ᦪḄC᪆DTst-./(2,0),(0,-3),uZv/ᙶ᪗AᐭC᪆DQ=2k+lx—3—b.3ᡠwᡠḄ#$%ᦪḄᐵDmy=rx—2.3ysty^-kx+bstz-x{|}yg~/Ḅlᙶ᪗T2stḄ⊤D.ᑖ᪆sty=-kx+bst)=-x{|kḄ;yg~/Ḅlᙶ᪗T-2,bḄ;.CSTst)=4x+bst)=-x{|ᡠw=-1,STstyg~/Ḅlᙶ᪗T-2,

88ᡠw/=-2,SᡠḄstḄ⊤DTy=-x-2.IV.9⁚ᡃ#$%ᦪC᪆DḄ஺#$%ᦪḄC᪆Dᵨᦪᓽ᪷⚪EḄv[ᩩ#$%ᦪC᪆Dy=H+b(A#O)Ev[ᦪk35Ḅ;V.¡¢1.᪷aᑡᩩᑏ¤¥Ḅ%ᦪᐵD.পsty=kx+5-./(-2,-1)(2)#$%ᦪE7x=l9y=37x=-l9y=l.2.ᑏv[#$%ᦪ§bḄ+,¨-./(-2,3).3.᝞+m©ª⌶¬®¯°±²|³´ᵨµK+.¶·¸ᦈ´
Lᑏ|³´y(ᐗ)|³»¼x(ᓟ¾)¿ÀḄ%ᦪᐵ.yÁ)30/20/r..........2...>010203040506070JᓟL)4.#$%ᦪ)=(+Ä*0)Ḅ+,-./(3,3)3(1,-1).bḄ%ᦪᐵDLÆ+,.5.▰ÈᨣᎷË©ᙢ¯ÍÎÍ⌕ᜧÐhÑ9Ò²#⊟ÔLÕÖ7ᙢÑ×ØÙÚÛÜ100ÝÞßaà06c.▰ÈᙠÑäaf#aå²ḄßæçÞßT34࠷,éêᑮÑ⚔ìíßæT32.2࠷.Ñî.ï⚪r#$%ᦪ¥ᵨ(ð)ᦟò᪗ᑭᵨ#$%ᦪôCõ¤ᐵö▭ø⚪.ᦟò»/ᮣúûᵨôCõ¤ᐵø⚪.ᦟòü/ᮣúûᵨᨵᐵôCõ¤ᐵø⚪.ᦟò.Iýø⚪þqÿ᛻

89ᡃ☢ᨵᐵᦪḄ᝞᪆᝞ᑭᵨᦪᐵ!"⚪ᕖ%&'(ᡃ&⁚*⌕Ḅ,⌕"⚪.II.ᐭ0*1☢ᡃᩭᦪḄ3ᵨ.415672008/ᑖḄ;<=>?ᐜᒴB;>5ᑖCDᑖEF;<208/ᑖGᒴ;>10ᑖC.HᑏJ&KLMN᝛>P;PLMx(ᑖ)TᓄḄᦪᐵVWXJYZ.ᑖ᪆[\⚪ySxTᓄḄ]^ᑖᡂ`K[5ᑖCa?10ᑖC.ᑏySxTᓄᦪᐵVL⌕ᑖᡂ`bᑖ.cYZLd⌕ᑖᡂ`KᩭXe⌕fgᔜiTjḄkln.20x+200(0

90ᵫÀD◤⌕260ᔴ[B—D,260—200+xᔴ.ÁÂᔜÃᵨ[A——C20xA——D25(200-x)B——C15(240-x)B——D24(60+x)½ÃᵨyḄÄyaxᐵV[y=20x+25(200-x)+15(240-x)+24(60+x).ᵫ᪆ᡈYZ«¦ÆJÇx=0Lylᨬ510040.ÈÉA~C஺ᔴD200ᔴ;B~C240ᔴ,D60ᔴ.ÉLᨬ10040ᐗ.½A~ᨵᧇ300ᔴB~200ᔴᐸ¸ᩩÎÏTGÐ᪵ᕖ%⚪aÑÏT°(¥ÒᨵᡠÏÔ[A——CxᔴA——D300-xᔴB——C240-xᔴB——Dx-40ᔴÕ᧜yaxḄᦪᐵV[y=20x+25(300-x)+15(240-x)+24(x-40).ᓄ×[y=4x+10140(40WxW300).ᵫ᪆¦[Çx=40Lylᨬ5[y=4X40+10140=10300ÈÉA~C40ᔴD260ᔴ;B~C200ᔴD0ᔴ.ÉLᨬ5l10300ᔴ.᝞iTjxḄkln(40WxW300Ḅᕖ%ᵫÀB~Dºᦪx-40ᔴ▭²Ï¦Ø(ÙᦪeA~²°ᨵ300

91ᔴᧇdϦØÚ¥300ᔴᡠ7xkl3ᙠ40ᔴᑮ300ᔴM.?5Ü[¹ᨵÝ¡TjḄ"⚪L¦7ᑖ᪆&TjMḄᐵV⌱kᐸ²ß¡TjàiTjᯠ?᪷â"⚪ᩩÎã¦7Õ᧜▭"⚪Ḅᦪ.&᪵µ¦7ᑭᵨᦪᩭ.ᙠ▭"⚪¥Ò²⌕fg᪷â▭äåiTjkln.µæçèÁ¡Té⚪᪵᝞êiTjklnë┯íî᧕Jᜫñòᑮ┯ñḄÜó.in*ᚪõAஹB`ö÷ᔣᵬஹú`ᙢöᐸ²ᵬᙢ◤ö15üᔴúᙢ◤ö13üᔴAஹB`ö÷ᔜ¦Jö14üᔴ.Aᙢᑮᵬᙢ50ᓟ8ᑮúᙢ30ᓟ8Bᙢᑮᵬᙢ60ᓟ8,ᑮúᙢ45ᓟ8.¶þ¡ᫀ
Ḅ(ᔴ•ᓟ)ᨬ.yᔴ•ᓟA
ᵬᙢ
xᔴᑣᙢ(14-x)ᔴB
ᵬᙢ
(15-x)ᔴᙢ
(x-1)ᔴ.ᔜ!Ḅᐵ#$%&᧜yx()Ḅ*ᦪy=50x+30(14-x)+60(15-x)+45(x-1).ᓄ-.y=5x+1275(1WXW14).ᵫ᪆1$%:3x=l4,y6ᨬ785X1+1275=1280.9:;A
ᵬᙢ1ᔴ
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,ᙢ0ᔴ
.:4ᨬ71280ᔴ•ᓟ.IV.=ᚪ7?@⁚=ᡃCDEFGHIᑖK*ᦪᙠM▭O⚪QḄRᵨᱯUVDEIWXYZḄ*ᦪO⚪ᡃC[\WM▭O⚪]^I_ᩩᚆ⌶ᡃCc_defᑮDE*ᦪḄh⌕ឋkl⌕ឋ.V.=\mn1ஹE⚪11.2—7ஹ9ஹ11ஹ12⚪.2ஹq=ᚪrstuvDG>ᦪMDᐗDGOPᦟ᪗1ஹ%fᢈxy᪗ᳮ_|*ᦪ_ᐗ_|~Ḅᐵ#᪷_|*ᦪḄW_ᐗ_|~ḄO⚪஺

922ஹ~y᪗ᔊ~*ᦪᐵ#O⚪ḄtuDEᵨὶ#ḄᦪDO⚪Ḅ஺3ஹr᝱y᪗DEᵨ*ᦪḄ~Ḅ~drᵨᐰ☢ḄᜐᳮO⚪Ḅ஺ᦟ_|*ᦪ_ᐗ_|~ᐵ#Ḅᳮ஺ᦟ•|*ᦪ_ᐗ|~ᐵ#Ḅᳮ஺ᦟ☢ᡃCDEI•|*ᦪ_|*ᦪV¡YZ()ᢥ᯿•¤ḄZᓄ¥¦Ḅ_§¨Rᐵ#©ᡃCª«¬DḄ_ᐗ_|~_ᐗ_|®1¯ᐗ_|~°±ᨵḼ´ᑗḄὶ#஺;¶⁚=]·ᡃC¸DḼᵨ*ᦪ~¹°º®1Fᵨ*ᦪḄ»ឋ¼ᙢ~¹°ºk®1ḄO⚪¶½VDEᦪDḄ_§¾¿Ḅ~஺CஹDEF⚪ᡃCᐜᩭÂ☢Ḅ¡YO⚪ᨵÃÄᐵ#¹1º~2x4-20-0.¹2º3ÊZË64*ᦪy=2x+20Ḅ6ÏÐO⚪_¨Ñ2x+20=0ky=2x+20,;¼1ÒᨵÃÄÓÔkÔḄᙢ~ÐO⚪¯¨Ñ¹1ºk¹2º,;@ÕÒÖᨵÃÄᐵ#Ш¹1º,~2x+20=Q$.x=-lQ¨¹2º,M▭Ò¸V3ᨴº4xḄO⚪¶$[Ú~2x+2N.Ü^-10,$Þ¶¡YO⚪M▭ÒVÔ_YO⚪஺O⚪ß;*ᦪÒ¹1ºk¹2ºÖVàÄ᪵Ḅᐵ#Ð20,-■cyI»â82ᙠ20xãäḄᙶ᪗V¹TO,0W,è~2é20=0ḄVklQᡠ[;Ò»âk2é20xãäḄìᙶ᪗Ḅ6¸V~2x+2O=OḄ஺HஹIJKL;¨Ò☢¡YO⚪Ḅíî$[ᑮ_Y_ᐗ_|~ḄO⚪$[ïYÓRḄ_|*ᦪO⚪Ó_ð஺ὃ~ax+b=O¹a,bôᦪºÊZxË64_|*ᦪõ=@*+13Ḅ60ᨵÃÄᐵ#ÐøùᐳÔûü~axHHº$[þᓄ3_|*ᦪ1X+JḄ604ÊZxḄ6஺;Ò¸Ó3Ñÿ
ax-xḄᙶ᪗Ḅ஺⚪▭!"#⚪஺MஹNOPᵨ1ஹ&ᡂ⊤)*#ᐗ#,-.⚪#,/ᦪ⚪!"#⚪஺12#ᐗ#,-.⚪#,/ᦪ⚪(1)5-.3x-2=0:x;<=/ᦪy=3x-2Ḅ;0?(2)5-.8x+3=0(3):x;<=/ᦪy=-7x+2Ḅ;0?

93DEFGᦪḄHIJFKax&ONaw஺Ḅ5Px;<=/ᦪQaxWḄ;0GSḄHIJKax-+b=OU0VḄ5P
WXYxḄᙶ᪗RஹS⚪T᪆ᱥ[\ᙠḄ^I!5`/bᐸ^Idbef2`/bghibḄ^I;17`/bjN5klmP39VpqF3ஹ:rstxḄuvwxyᩩ{|/ᦪy=3x+8Ḅvw}ᑡᩩ{FN1Vy=0,N2Vy=-74ஹ-.ax+b=0Ḅ5!-2,}ᑡ!
y=ax+bḄ!NVVஹWᚪYZᡃᑮxyjᡃ!yḄjᡃᨵxyᶧᔩjஹ[\]^1ஹm2ஹlmP45Ḅ1⚪DG>ᦪMDᐗDGQRJO_`1.5#ᐗ#,J!::#,/ᦪᜧNᡈV0=KrstḄu¡.2.5ᐵxḄkx+b>mx+n§ᓄ;FN1V:rstxu<=
y=Nk-mVx+b-nḄᙠxḄ-.ᡈN2VK:xu<=
y=kx+bḄᙠ
y=mx+nḄḄ-.N2;“V”=!"᪵Ḅ⍝ᳮVabc¯Fᵨ±Ḅ-k52x+l>3x+4ᑖ᪆FN1Vµᓄ;-x-3>0,¶
Q-x-3,ᯠ¸¹ºFrstxu<=

94ḄᙠX-jᡈN2V±¶
y=2x+ly=3x+4,ᯠ¸¹ºF»¼½xḄ
y=2x+lḄᙠ
y=3x+4ḄḄ-j5F-kN1V¾;F-x-3>0,ᙠ
Hᙶ᪗¿±¶/ᦪy=-x-3ḄN1V.GJ¶:x<-3=ᩩ
Ḅᙠx-ᓽ=y=-x-3>0,ÂÃḄ5Ä!x<-3.-kN2VžḄÆJḼ!#,/ᦪᙠ"#ᙶ᪗¿±¶
y=2x+ly=3x+4N2V,GJ¶ÈḄḄᙶ᪗!x=-3,ÂÃ:x<-3=="#xḄ
y=2x+lḄᙠ
y=3x+4Ḅ-Ã=ᨵ2x+l>3x+4,ÂÃḄ5Ä!x<-3.ÉᐷËਮᡃÍ⌱1.
y=x-lḄᙠx-=»ḄrstḄ¡!NVA.x>lB.x>lC.x-2B.x?-2C.x<-2D.xW-23.ᐵxḄax+l>0NaWOVḄ5Ä!xீl,ᑣ
y=ax+lxḄ!NVA.N0,1VB.N-1,0VC.N0,-1VD.N1,0VਮᡃÍÕ4.:rstxḄvw=
y=-x+2Ḅᙠx}-.5.
y=x-2y=-x+2N2,0V,ᑣx-22-x+2Ḅ5Ä!.6.
y=-3x-3xḄᙶ᪗!,ᑣ-3x+9>12Ḅ5Ä!.7.ᐵxḄkx-2>0NkWOVḄ5Ä!x>-3,ᑣ
y=-kx+2xḄ!8.-x+5>3x-3Ḅ5Ä!x<2,ᑣ
y=-x+5y=3x-3Ḅᙶ᪗!.ਮᡃÍ×9.ØᓫÚ◤⌕ᵨÝÞᜓà#[Ýáᡈ#âᨵ¶ãäåᐸḄ#æçèᔠ"êëÝdᨴíîxkm,Yï[ÝáḄᨴãð!yᐗYï¶ãÝäåḄᨴãð!yᐗy,y

95ᑖñxòóḄ/ᦪᐵ¿!᝞11-34ᡠöḄᩩ
¹º÷×}ᑡ⚪:(1)dᨴíîḄø.ᙠxy¡ᑁ=ãâᨵ¶ãÝäåḄ¶ãÝᔠúj(2)dᨴíîḄø.ûü=ãæÝḄðᵨ"j(3)᝞ýᓫÚþÿᨴḄ2300km,ᓫḄᔠ10.ᙠᙶ᪗"#$%&'ᦪy*-x+1.yz=2x-2Ḅ1234᪷612789ᑡ;⚪:(1)ᑏ%AByi=-x+l.y=2x-2ḄEFPḄᙶ᪗.2(2)AHᑏ%IJxKLMNyi>y2Pyi0iy2<08ᫀI1.A2.C3.D4.x>25.x226.(-1,0)Px<-l7.(-3,0)8.(2,3)9.জJ0<*<1500N3vᨵ%wxḄ%ᔠPঝ1500kmPঞz{Ḅᔠ

9610.জP(1,0)PঝJxvlNyi>y23Jx>lNyFy?11.(1)k=>b=5,/.y=x-2>y=-3x+512ᶍP(2)12%IজJx<2Ny௃vy2PঝJx32Nyi>yP2(3)•.•AByi=Px-2.xḄEFB(4,0),ABy=-3x+5.xḄEFC(1,0),2,12%IজJx<4NyFO,Jx>§Ng2<0,ᡠJg4N3yi>0PJx>PNy2<0,/.Jx>4Nyi>0iy<0.2ᐗ&.&'ᦪᦟ᪗IW᪗I1ஹᳮᐗ&.&'ᦪḄᐵ"2ஹ᪷6&'ᦪḄ12]ᐗ&Ḅ¡.3ஹᑭᵨᐗ&¢£&'ᦪḄ⊤¥¦d᪗:§¨Ḅ©ὃX«¬,ᙠd1®%.12¯°Ḅᐵ",±ᐭᐗ&12³3N´µ¶Ḅᦪ·¸ᔠḄ¹Xd.º»᪗:§¨Ḅ¼{S½,®%X12¯°Ḅ¾¿ᐵ"3ÀÁ¶ÂÃWḄὶ",´µ¶ḄŹ,ÆǶÈᦪḄᐶÊ.ᦟËFI1ஹᐗ&X&'ᦪḄᐵ"2ஹ᪷6&'ᦪḄ12]ᐗ&Ḅ¡ᦟÌFIX'ᦪ¯°Ḅ¾¿ᐵ"ᓽᦪ·¸ᔠḄ¹Xdᦟ¨IAyஹÎÎ1ஹÏ:ÐÑᐗ&Ḅ2ஹ&'ᦪḄ1ÒÓÐ_____-r3ஹ᝞1,]&'ᦪḄ1ÒḄ᪆¦—71ߟ1ஹAXஹÛÛ1ஹ;⚪Ix+y=5ḄᨵÜÝᑏ%ᐸ#Ḅßᩭáx+y=5ḄᨵâᦪÜ3᝞Irx=~lrx=0rx=lrx=2rx=3ty=6ty=5*-y=43*-y=2å2ஹᙠAæᙶ᪗"#ᑖèé%êᙶ᪗ḄF3ëÏᙠ&'ᦪy=5-xḄ1Òᔩ3ஹᙠ&'ᦪy=5—xḄ1ÒíKF3ëḄᙶ᪗〉ᔠx+y=5ᔩ4ஹx+y=5Ḅᙶ᪗ḄᡠᨵFᡂḄ12.&'ᦪy=5-xḄ1ÒZᔩ

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