中考数学知识点复习 初中数学知识点总结

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1:ᐗḄᭆ1.ᐗ3xz+5x-2=0Ḅᦪ⚗-2.2.ᐗ3x#4x-2=0Ḅ⚗!ᦪ"4,ᦪ⚗-2.3.ᐗ3xz-5x-7=0Ḅ⚗!ᦪ"3,ᦪ⚗-7.4.%3x(x_l)_2=_4xᓄ"+,"3X2~X_2=0.
2-./ᙶ᪗!2Ḅ341../ᙶ᪗!56A(3,0)ᙠy:;஺2../ᙶ᪗!56x:;Ḅ=>Ḅ?ᙶ᪗"0.3../ᙶ᪗!56A(1,1)ᙠ@A▲.4../ᙶ᪗!56A(-2,3)ᙠ@CA▲.5../ᙶ᪗!56A(-2,1)ᙠ@A▲.
3-DEFGḄHIJᦪH1.Kx=2L6Jᦪy=J2x-3ḄH"1.2.Kx=3L6Jᦪy=1ḄH"1.x-23.Kx=-lL6Jᦪv=1ḄH"1.2x-3
4-JᦪḄᭆNឋP1.Jᦪy=-8xJᦪ.2.Jᦪy=4x+lRSTJᦪ.3.Jᦪy=-^xVSTJᦪ.24.WᱥYy=-3(x-2)?-5Ḅ[\ᔣ^.5.WᱥYy=4(x-3)L10Ḅ`a:x=3.6.WᱥYy=c(x-l)2+2Ḅ⚔ᙶ᪗(L2).7.VSTJᦪy=3ḄeAᙠ@ஹgA▲.x
5-ᦪhḄiᙳᦪ53ᦪ2kᦪ1.ᦪh13,10,12,8,7Ḅiᙳᦪ10.2.ᦪh3,4,2,4,4Ḅkᦪ4.3.ᦪh1,2,3,4,5Ḅ53ᦪ3.
6-ᱯmg/JᦪHn1.cos30°=-22.sim60°+COS26O0=1.3.2sin300+tan450=2.4.tan45°=1.5.cos600+sin300=1.
7-ᙊḄឋP1.|ᙊᡈ.~ᡠ`Ḅᙊᕜ/./.2.=>g/ᨵ᜜ᙊ.3.ᙠi☢ᑁ6ᑮḄḄḄ6"ᙊ6"|~Ḅᙊ4.ᙠᙊᡈᙊ56Ḅᙊ/ᡠ`Ḅ.

15.ᡠ`Ḅᙊᕜ/ᙊ/Ḅ|.6.ᙊᡈᙊḄ|~.7.gᙊ.8.Ḅᩩ.9.ᙠᙊᡈᙊ56Ḅᙊ/ᡠ`Ḅ.10.ᙊiᑖḄ.~ᚖ.஺
8-.Y2ᙊḄ34ᐵ!1..Y2ᙊᨵ¢£ᐳL,¥¦.Y2ᙊᑗ.2.g/Ḅ᜜ᙊḄᙊ¥¦g/Ḅ᜜.3.ᑗ/ᡠᜳḄᡠ`Ḅᙊ/.4.g/ḄᑁᑗᙊḄᙊ¥¦g/Ḅᑁ.5.ᚖ.|~Ḅ.Y©"ᙊḄᑗY.6.|~Ḅ᜜ª«¬ᚖ.|~Ḅ.YᙊḄᑗY.7.ᚖ.|~Ḅ.YᙊḄᑗY.8.ᙊḄᑗYᚖ.ᑗḄ|~.
9-ᙊ2ᙊḄ34ᐵ!1.ᙊᨵ¬ᨵ£ᐳL6¥¦®ᙊ᜜ᑗ.2.¯ᙊḄ°Yᚖ.iᑖ£ᐳ.3.ᙊᨵ£ᐳL,¥¦®ᙊ¯.4.ᙊᑁᑗL6®ᙊḄ£ᑗYᨵᩩ.5.ᑗᙊḄ°Y©ᑗ.
10-R±²ឋP1.R³²Ḅ5/"60°.2.´R±².3.R±²µ:`ae.4.R±²µ5`ae.
11-ᐗḄ¶1.x2-4=0Ḅ᪷"____.A.x=2B,x=-2C.x¹2,x¹-2D.x=42.X2-l=0Ḅ᪷"A.x=lB,x=-lC.x=l=-lD,x=2,X3.(x-3)(x+4)=0Ḅ᪷".A.x=-3,x=4B,x=-3,x=-4C,x=3,x=4D,x=3,x=-44.x(x-2)=0Ḅ᪷"--A-x,=06x/2B,x=l,x=2C,x=0,x=-2D,x=l,x=-25.xz-9=0Ḅ᪷"___.A-x=3B,x=-3C,x=3,x=-3D.x,=+.,x¹½
12-¶Ḅ¾¿NᣚᐗÁ1.ᐗ4x2+3X-2=0Ḅ᪷Ḅ¾¿A.ᨵḄÂᦪ᪷B.ᨵÃḄÂᦪ᪷C.ᨵÂᦪ᪷D.ÄᨵÂᦪ᪷2.ö,ᑨÆ3xz-5x+3=0Ḅ᪷Ḅ¾¿.A.ᨵḄÂᦪ᪷B.ᨵÃḄÂᦪ᪷

2C.ᨵÂᦪ᪷D.ÄᨵÂᦪ᪷3.ö6ᑨÆ3x°+4x+2=0Ḅ᪷Ḅ¾¿.A.ᨵḄÂᦪ᪷B.ᨵÃḄÂᦪ᪷C.ᨵÂᦪ᪷D.ÄᨵÂᦪ᪷4.ö,ᑨÆ4xz+4x-l=0Ḅ᪷Ḅ¾¿A.ᨵḄÂᦪ᪷B.ᨵÃḄÂᦪ᪷C.ᨵÂᦪ᪷D.ÄᨵÂᦪ᪷5.ö,ᑨÆ5XL7X+5=0Ḅ᪷Ḅ¾¿A.ᨵḄÂᦪ᪷B.ᨵÃḄÂᦪ᪷C.ᨵÂᦪ᪷D.ÄᨵÂᦪ᪷6.ö,ᑨÆ5x#7x=-5Ḅ᪷Ḅ¾¿____.A.ᨵḄÂᦪ᪷B.ᨵÃḄÂᦪ᪷C.ᨵÂᦪ᪷D.ÄᨵÂᦪ᪷7.ö,ᑨÆxz+4x+2=0Ḅ᪷Ḅ¾¿____.A.ᨵḄÂᦪ᪷B.ᨵÃḄÂᦪ᪷C.ᨵÂᦪ᪷D.ÄᨵÂᦪ᪷8.ö6ᑨÇ5y2+1=2^yḄ᪷Ḅ¾¿A.ᨵḄÂᦪ᪷B.ᨵÃḄÂᦪ᪷C.ᨵÂᦪ᪷D.ÄᨵÂᦪ᪷X25(x—3)X29.ᵨᣚᐗÁ¶T--------=4LÉ-y,ÊËÌC____x-3X2x-3A.y2-5y+4=0B.y2-5y-4=0C.y2-4y-5=0D.y2+4y-5=0x25(x-3)x-3io.ߟ---------=4LÉy,_____x-3X2x2A.5y2-4y+l=oB.5y2-4y-l=0C.-5y2-4y-l=0D.-5y2-4y-l=0XXX”.ᵨᣚᐗÁ¶(77T)2-5(----r)+6=0L,Ñfy,ᑣÔᓄ"ᐵyḄx+1x+1A.y2+5y+6=0B.y2-5y+6=0C.yz+5y-6=0I).y2-5y-6=0
13-EFGḄÖHØ1.Jᦪy=Jx-25,EFGxḄÖHØ___.A.xK2B.xW-2C.x>-2D.xW-212.Jᦪy=--ḄEFGḄÖHØ_______.x-3A.x>3B.x23C.xK3D.x"=>Âᦪ13.Jᦪy=——ḄEFGḄÖHØX+1A.x>TB.x>-lC.xWlD.xrT14.Jᦪy=—-fḄEFGḄÖHØ_____X-lA.x^lB.xWlC.xWlD.x"=>ÂᦪJx-55.Jᦪy=2ḄEFGḄÖHØA.x>5B.x95C.x#5D.x"=>Âᦪ

3
14-JᦪḄᭆ1.^ᑡJᦪ56RSTJᦪ.8A.y=-8xB.y=-8x+lC.y=8x2+lD.y=—x2.wißᵫᜟmâ____8A.y=&(B.y=8x+lC.y=-8xD.p83.MliWæ஺=8*ঝ=8x4ত=-8K.êëᨵ____.A.1B.2C.3D.4
15-ᙊḄឋP1.᝞e6C²ABCDᑁ஺0,DNC=80°,ᑣNAḄᦪ___.A.50°B.80°C.90°D.100°2.ᦋ1᝕eG0ᵯᙊᕜ/NBAD=50°,ᑣᙊᕜ/NBCDḄᦪ.A.100°B.130°C.80°D.50°3.ò1᝕e஺0ᵫᙊ/NBOD=10óT6ᑣᙊᕜ/NBCDḄᦪ____A.100°B.130°C.80°D.50°4.D-᝞e6C²ABCDᑁ0ô,õö÷ø5RùḄ___.A.ZA+ZC=180°B.ZA+ZC=90°C.ZA+ZB=180°D.ZA+ZB=905.|~"5cmḄᙊ56ᨵᩩ"6cmḄ,ᑣᙊᑮûḄ".A.3cmB.4cmC.5cmD.6cm6.D-᝞e6ᙊᕜ/NBAD=50°,ᑣᙊ/NBODḄᦪ.A.100°B.130°C.80°D.507.ᵫ1᝞ᑮ0056ᓽḄýó"10G.ᑣᙊᕜþ/ACBḄÿ
.A.100°B.130°C.200°D.508.᝞ᑮ0ᵫᙊᕜNBCD=13TᑣᙊNBODḄᦪ"---A.100°B.130°C.80°D.50°9.ᙠ஺0'(ABḄ)*8cm,ᙊ0ᑮABḄ./*3cm,ᑣ஺0Ḅ01*____cm.A.3B.4C.5D.10io.67leoᵫ:ABḄ;ior,ᑣᙊᕜNACBḄ="___A.100°B.130°C.200°D.50°12.ᙠ01*5cmḄᙊ'ᨵ?ᩩ()*6cm,ᑣᙊᑮB(Ḅ./*?.A.3cmB.4cmC.5cmD.6cmCDE16FEஹHIJᙊḄKLᐵN1.OC஺஺Ḅ01*10cm,᝞P?ᩩHIJᙊ0Ḅ./*10cm,QRSᩩHIJSTᙊḄKLᐵN*____A.U/B.UᑗC.UWD.UWᡈU/2.OCᙊḄ01*6.5cm,HI1JᙊḄ./*7cm,QRSᩩHIJSTᙊḄKLᐵN"A.UᑗB.U/C.UWD.U/ᡈUW3.OCᙊ0Ḅ01*6.5cm,PO=6cmQREPJSTᙊḄKLᐵN"?A.Eᙠᙊ[B.EᙠᙊᑁC.Eᙠᙊ᜜D.^_`a4.bCᙊḄ01*6.5cm,HI1JᙊḄ./*4.5cm,QRSᩩHIJSTᙊḄcᐳEḄTᦪ"----

4A.0TB.1TC.2TD.^_`a5.?TᙊḄᕜ)*acm,☢g*acmz,᝞P?ᩩHIᑮᙊḄ./*TTcm,QRSᩩHIJSTᙊḄKLᐵN".A.UᑗB.U/C.UWI).^_`a6.OCᙊḄ01*6.5cm,HI1JᙊḄ./*6cm,QRSᩩHIJSTᙊḄKLᐵN"_________.A.UᑗB.U/C.UW1).^_`a7.OCᙊḄ01*6.5cm,HI1JᙊḄ./*4cm,QRSᩩHIJSTᙊḄKLᐵN".A.UᑗB.U/C.UWD.U/ᡈUW8.OC஺Ḅ01*7cm,PO=14cmᑣP0Ḅ'EJSTᙊḄKLᐵN■"___.A.Eᙠᙊ[B.EᙠᙊᑁC.Eᙠᙊ᜜D.^_`aCDE17FᙊlᙊḄKLᐵN1.J00Ḅ01ᑖn*3cmJ4cm,o00=10cm,ᑣSpᙊḄKLᐵN".I212A.᜜/B.᜜ᑗC.UWD.ᑁᑗ2.OC஺0ஹḄ01ᑖn*3cmJ4cmo00=9cm,ᑣSpTᙊḄKLᐵN"__1212A.ᑁᑗB.᜜ᑗC.UWD.᜜/3.OC஺0ஹḄ01ᑖn*3cmJ5cm,o00=lcm,ᑣSpTᙊḄKLᐵN"____1212A.᜜ᑗB.UWC.ᑁᑗD.ᑁq4.OC஺0ஹ஺஺Ḅ01ᑖn*3cmJ4cm,o00=7cm,ᑣSpTᙊḄKLᐵN"?.1212A.᜜/B.᜜ᑗC.UWD.ᑁᑗ5.OC00ஹḄ01ᑖn*3cmJ4cm,pᙊḄ?ᩩ᜜cᑗI)4rᑣpᙊḄKLᐵN"___.12A.᜜ᑗB.ᑁᑗC.ᑁqD.UW6.OC஺0ஹ஺஺Ḅ01ᑖn*2cmJ6cm,o00=6cm,ᑣSpTᙊḄKLᐵN"____.I212A.᜜ᑗB.UWC.ᑁᑗD.ᑁqCDE18FcᑗIs⚪1.᝞Ppᙊ᜜/ᑣcᑗIḄᩩᦪ*A.1ᩩB.2ᩩC.3ᩩD.4ᩩ2.᝞Ppᙊ᜜ᑗuvḄcᑗIḄᩩᦪ*.A.1ᩩB.2ᩩC.3ᩩD.4ᩩ3.᝞PpᙊUWQRuvḄcᑗIḄᩩᦪ*.A.1ᩩB.2ᩩC.3ᩩD.4ᩩ4.᝞PpᙊᑁᑗuvḄcᑗIḄᩩᦪ*A.1ᩩB.2ᩩC.3ᩩD.4ᩩ5.OC஺0,ஹḄ01ᑖn*3cmJ4cm,o00=9cm,ᑣSpTᙊḄcᑗIᨵᩩ.A.1ᩩB.2ᩩC.3ᩩ1).4ᩩ6.OC00,஺0,Ḅ01ᑖn*3cmJ4cm,o0,0.=7cm,ᑣSpTᙊḄcᑗIᨵᩩ.A.1ᩩB.2ᩩC.3ᩩ1).4ᩩCDE19FwxyzJᙊ1.᝞P(D0Ḅᕜ)*lOncm,QRuḄ01*___.A.5cmB.JiocmC.10cmD.5rrcm2.w~z᜜ᙊḄ01*2,QRuᑁᑗᙊḄ01*A.2B,V3C.1D.ট"3.bCwzḄy)*2,QRSTwzᑁᑗᙊḄ01*

5A.2B,1C.72D.2n4.ᡧzḄ☢g*7,01*2,QRSTᡧzḄᙊ*------A.30°B.60°C,90°D.120°5.OCwyzḄ01*R,QRSTwyzḄy)*_____.A.RB.RC.V2RD.6.ᙊḄᕜ)*C,QRSTᙊḄ☢gS=------cC2C2C2A.nC2B.C.cD..712714717.w~zᑁᑗᙊl᜜ᙊḄ01*A.1:2B,1:V3C.A:2D.1:⊟8.ᙊḄᕜ)*C,QRSTᙊḄ01R=cCA.2ᐔCB.ᐔ஺C.T—D.?2Ttn9.OCwzḄy)*2,QRSTwz᜜ᙊḄ01*.A.2B.4C.20D.2*310.OCw~zḄ01*3,QRSTw~zḄy)*.A.3B.AC.372D.3rCDE20Fᦪs⚪1.OCFᐵXḄ?ᐗax2+bx+c=3Ḅ?T᪷*X1=2,ᦪy=ox2+bx+cḄ¡¢£"HIx=2,ᑣ¤ᱥIḄ⚔Eᙶ᪗".A.(2,-3)B.(2,1)C.(2,3)D.(3,2)2.o¤ᱥIḄ©᪆«*y=2(x-3"+2,ᑣuḄ⚔Eᙶ᪗".A.(-3,2)B.(-3,-2)C.(3,2)D.(3,-2)3.?ᦪy=x+lḄ¬ᙠ.A.?ஹஹ~¬▲B.?ஹ~ஹ¯¬▲C.?ஹஹ¯¬▲D.ஹ~ஹ¯¬▲4.ᦪy=2x+lḄ¬^°±.A.?¬▲B.¬▲C.~¬▲D.¯¬▲25.²³ᦪy?Ḅ¬ᙠ.XA.?ஹ¬▲B.~ஹ¯¬▲C.?ஹ~¬▲D.ஹ¯¬▲106.²³ᦪy=-Ḅ¬^°±.XA?ஹ¬▲B.~ஹ¯¬▲C.?ஹ~¬▲D.ஹ¯¬▲7.o¤ᱥIḄ©᪆«*y=2(x-3"+2,ᑣuḄ⚔Eᙶ᪗"_.A.(-3,2)B.(-3,-2)C.(3,2)D.(3,-2)8.?ᦪᔆ-x+lḄ¬ᙠ.A.?ஹஹ~¬▲B.?ஹ~ஹ¯¬▲C.?ஹஹ¯¬▲D.ஹ~ஹ¯¬▲9.•ᦪy=-2x+lḄ¬°±.

6A.?ஹஹ~¬▲◀ஹ~ஹ¯¬▲C.?ஹ~ஹ¯¬▲ṃ?ஹஹ¯¬▲110.OC¤ᱥIy=ax*bx+caு0aஹbஹc*¹ᦪḄ¡¢£*x=l,ᦪ¬[ᨵ~EAT,yஹBCy,y.hC2,y,,ᑣy,ஹ4ஹy,Ḅᜧ¼ᐵN"Ayf",B.y0,ᓄÅ᪷«xj-஽Ḅw`ÎP*?.1⍩

72.ᓄÅ᪷«aḄÎP"?.A."J-a-IB.-Ja+1D.7a-l3.oaa,A.ayfabg-aJ-abC.ayj-abD.-a4abI~a+1io.ᓄÅ᪷«aj—ß?ḄÎP"A.J-a-1B.-J-a-1c.Ja+1D.-Ja-111.oab<0,ᓄÅ᪷«?,?42àḄÎP"____aA.báB.-b"C.D.-b4-bCDE23FḄ᪷2xm,31.â"_____ãᑖ«?^??-1?0äåæç᪷.x2-4x+2A.1B.2C.-lD.22x1?éḄ©*.2.ᑖ«-—èA.x=-2ᡈx=0B.x=-2C.x=0D.êëᦪ᪷13.ᵨᣚᐗî©+—+2(x__)-5=0,ïè?-=y.ᑣðᓄ*ᐵyḄX2XxA.y2+2y-5=oB.y2+2y-7=0C.y2+2y-3=0D.y2+2y-9=0

84.ñ᧑(aT)X2+2ax+az+5=0ᨵ?T᪷"x=-3,ᑣaḄÇ*A.-4B.1C.-4ᡈ1D.4ᡈTQX+115.ᐵxḄó?1°ᨵç᪷,ᑣëᦪa*?.A.a=lB.a=-1C.a=±1D.a=26.⚗Nᦪ*1Ḅ?ᐗḄpT᪷ᑖn*-ஹ-6ᑣST".A.x2+2,*/3x-l=OB.x2+2^x+l=0C.x2-2^1^x-l=OI),x2-2^/^x+l=O7.OCᐵxḄ?ᐗ(k-3)X2-2kx+k+l=0ᨵpT^U÷Ḅëᦪ᪷ᑣkḄøÇú"______.3333A.k>-yB.k>-ûkW3C.k<--ý.1<ு21<*3CDE24FÆEḄᙶ᪗1.bCEPḄᙶ᪗*(2,2),PQIIx£PQ=2,ᑣQEḄᙶ᪗"____.A.(4,2)B.(0,2ᡈ(4,2)C.(0,2)D.(2,ᡈফ4)2.᝞PEPᑮx£Ḅ./*3,ᑮy£Ḅ./*4,EPᙠ¯¬▲ᑁᑣPEḄᙶ᪗*.A.(3,-4)B.(-3,4)C.4,-3)D.(-4,3)3.±EP(l,-2)ÿx
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