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2010()(4,120,:3148:3010:30)(50,5),,1.x,x-xA.B.C.D.2.(a+b)2=8,(a-b)2=12,abA.1B.-1C.4D.-43.bk0,y=kx+bA.B.C.D.4.,30%,50%,A.20%B.50%C.70%D.80%5.20102011-20102009=2010x20092011,xA.2008B.2009C.2010D.20116.,a,b.,A.1a+bB.(1a+1b)C.aba+bD.1ab7.,ABC34,ABdA.d=1B.d=5C.d=7D.1d78.1,ABCD,ABCD,ABC=90,PB,BCDD.Px,ABPy,yx2,BCDA.3B.4C.5D.69.3,CO,CACBOAB,PAMB,C=x,APB3A.xB.(90-x2)C.(90-x)D.(180-x)410.4,ABC,C=90,DBC,ABC,AD,EF,sinBEDA.35B.34C.23D.57(40,5)11.P(0,1),O,QPO=150,PQ2,Q.12.A,B,-4,2x+23x-5,AB,x.13.50,36,20,8,.14.x2+1x2=3,x0,x+1x.15.cb0a,a+b+c=1,M=b+ca,N=a+cb,P=a+bc,M,N,P.16.5,ABCD,AB=2,BC=3,MB8220111=MC,DAM.5617.6,ABCD,ADBC,AB=CD=AD=1,BA=12,MNADBC,PMN,PC+PD.718.7,ABCD,PBC,DPABQ,BCBP-ABBQ=.(30,15)819.8,ABC1,PAB(PB),CPCPD(DABC),AD.(1)ABCD,;(2)BP=x,PADy,yx,PADx.20.AB.,15750.AB2300;AB2050.(1)AB?(2)A5,B?(3),AB6,700;4000;AB100150.?12345678910CBDCBCDABA:1.x0,|x|-x=x-x=0;x0,|x|-x=-x-x=-2x0,C.2.a2+2ab+b2=8,a2-2ab+b2=12,4ab=-4,ab=-1,B.3.bk0,b0,k0b0,k0,,,,D.4.20%,50%,70%,C.5.20102011-20102009=2010x20092011,20102009(2010-1)(2010+1)=2010x20092011,2010200920092011=2010x20092011,x=2009,B.6.1a+1b,1(1a+1b)=aba+b.C.7.ABC.D.8.,BC=2,CD=3,SBCD=1223=3,A.9.OAOB,OACA,OBCB,,B.10.EDF=45,CDF+45=BED+45,BED=CDF,CD=1,CF=x,CA=CB=2,DF=FA=2-x,RtCDF,x2+1=(2-x)2,x=34,sinBED=sinCDF=CFDF=35,A.11.(1,1+3)(-1,1+3);,P(0,1),QPO=150.922011112.2x+23x-5=4x=115.13.50-8=42,x,(36-x);(20-x),(36-x)+x+(20-x)=42,x=14.14.x2+1x2=3,x2+2+1x=5,(x+1x2=5,x0,x+1x=-5.15.a+b+c=11+b+ca=1a,M=b+ca=1a-1,N=a+cb=1b-1,P=a+bc=1c-1,cb0a,1a1c1b,1a-11c-11b-1,MPN.16.DDGAM,23=12AMDG+ABBM22,DG=2.4;17.3;PACMNPC+PD.18.1;BCBP=ADBP=AQBQ,BCBP-ABBQ=AQBQ-ABBQ=AQ-ABBQ=BQBQ=1.19.(1)ABCD,:PA,ABCCPD,ACB=DCP=60,1=2,AC=BC,DC=PC,ADCBPC,DAC=B=BCA=60,ADBC.1=260,DCB120,B+DCB180,DCAB,ABCD.PA,PCAC,AB=BC=CA=AD=DC,ABCD,,ABCD.(2)(1)BAD=120,AD=BP=x,PDAPM,M,PAM=60,APM=30,BP=x,AB=1,AP=1-x,AM=12(1-x),PM=32(1-x)y=12ADPM=12x32(1-x)=-34(x2-x)=-34(x-12)2+316(0x1).x=12,y316,x=12PAD316.20.(1)ABab.:a+2b=23002a+b=2050a=600b=850()(2)ABmn.600m+850n=15750,m=-1712n+31515.A5,-1712n+315155.n15,B15.(3)Ax,B(6-x),:500x+700(6-x)4000100x+150(6-x)700,1x4.x,x=1,2,3,4.4.()0320111