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1212.3.4....1112.502030.2120203.0.00.4.00.51.200a)0()0(0)0(aaaaaa3.1100.2a+b=b+a(a+b)+c=a+(b+c)3.21.2.33100.2ab=ba(ab)c=a(bc)a(b+c)=ab+ac.31ab=1ab.40.000.51anaannana.261..24.1AB0CD2ABCD3A1B0C1D4)2(244A0B32C32D165A1B0C-1D1634+7A0B8C14D872A21B21C2D2842aaA2B2C22D921yxyx=A1B1C0D310abAa+b0Bab0Cb-a0D|a||b|5115+6=________56=_________.1256=_______56=___________.132122_________21244=________.1427132__________9132________.1520032002)1(1_________1664_____________________641775__________.18abcdm2a+b=_______cd=______m=__________.19a5a=_____|a|=______|a3|=________.20|a|=4|b|=6ab0|a-b|=__________.122)5()25(8482145)2(5352133)2(3)3(3224)32()4(8245)3()6()2(16323695)31(53.1100/1+32+4+75106100100100/1+32+4+751072(2)12311xyxy2a2b31ab.122yxx+y22a-1/3b(x+y)81xyxy)()(2yxyx22yxx+y.23)(312baba.1)()(2yxyx23)(312baba210.2x2y0.2xy224abc4ac3130154532mn423nm5()()abab33267311pqpqnnnn134625.10.2x2y0.2xy2xy.24abc4acb.313015.4532mn423nmmn.5(a+b)()()abab332.67311pqpqnnnnpqpn+1qn.123456..125(a+b).9383432xyxyzzzzyxyx23438zx4.83432xyxyzz463xyz21485322222xyxy18562222xyxy2422xy285632222xyxy2822xy1..22223658yxyx2222yx1..2..a22aa2.3225ba1032212ba.a22a.ab+cd.1]1a2bab2.2314x3y.325a27.4xy..1()()2122222abab21343xy3[()]22573a4xyy1.2.1.2.111121212222()RrrR2Saaa121414222Saa121822Saa341822.3.112312abb.23xy53.3.1.1b.23xy533...3xy515.3xy53xyyyyy.3.123.4.453121225xyxyxym1.2m.1421xym4.2m112m2.5x2y2522124.31x5y31516.246.12m28m3.1421xmy42m2.5x2y254.31x5y316.212m28m3.2m2.2468m.5.6a2b23ab4a4b8b57a3123a4b5a6b.12.34.36a2b23ab4a4b8b57a3a.a4a4.b5.123a44b554a4b7a36a2b23ab38b568b53ab36a2b24a4b7a3...62314313521xyxymn5m+3n.x133m-1=5,m=2y2n+1=3,n=15m+3n.2314313521xyxymn3m-1=5,m=22n+1=3,n=15m+3n523113..7a2bc2.4257232323ababcababcab.abc2112.a2a2bb1c212c425742575232323232323ababcababcabababcababcababcabc2112521125.8.abab4243()()()abababab.abbabababa14babababa,..abababab414243244314813723()()()abababab..9402113222yxyyxyx.00.021012yxxy10120xy112xy112xyxyy22341121121412223112114141812141321413215932.101647232yxyx.2327xy235xy461xy2231xy2511019..11xyyzzx23232yzzxxy.ABxyxyzxCyzzxxy23232.BAABCABABBCB22..232223yzzxxyxyyzzx23224669yzzxxyxyyzzxyzzx1669yzzx.BAABCABABBCB22..12AxxBxxCxx54133876222ABCx.xxABCxABCx.ABCxxxxxx541338762225413387651643713842222xxxxxxxx4ABC.13AxxyyBxxyy222232xy124AB.ABxy124.AB0ABAB0ABAB0AB.ABx12y4ABAB.17xyAxxyy124322123124487422Bxxyy222212124429222874294ABABxxyyxxyy222232xyxyxyxyxyx332322222xy12431231242142ABAB0.14.aba.18abaaaabab.b0abab0abab0aba.ababb0aba0abab0abab0aba..1(2006)nmnmA0B2mCn2Dnm22..nmnmnnmnm2,C2(2006)x=2381xA21B1C4D8.18812813B.32006221xy2243xy___________xy19.221xy2243xy53123)2(22yx...4006.ab(ab),,(1),,(2),,()(A)a2-b2=(a+b)(a-b).(B)(a+b)2=a2+2ab+b2.(C)(a-b)2=a2-2ab+b2.(D)a2-b2=(a-b)2.1a2-b22))(())(22(21babababaA.A.52005112335n___________.11233547n2n1.2n120122241xyxabcab3,,0,32,4,3A3B4C5D62.1,212,3,1,21,2122xxbabbaabA2B3C4D5423223125694.3bmabababammA.2B.3C.4D.54A.5Babc.3Cx.41Dxyz.265.xy2A.xyB.xyC.xy2D.xy12222222.6bababaAaabBaab..3322CaabDaab..23227.n3yxyxByxyxAnn22333.21.312221..yxyxDxyyxCnnnn821A2xx22x=x2B2xx22x=x2C2xy2x=yD2xx22x=x292x4x23x5A4x25x5B4x25x5C4x2x5D4x2510.3x2y3xy2x33x2yAx33xy2Bx33xy2Cx36x2y3xy2Dx36x2y3xy2112)23(21211babaA.()31122122B.()31221122C.()31221122D.()3112212212200515aA15+aB15aC15aDa15832413.0ab__________.14.2x3yn3xy5n=_________.15.m+212mxy23xy3m=___________.16.2x5a7x2a=__________.17.x22932xx____________.18abab325abababab____________.19xyxy15121015858xxyy______.20a16________.22212223252627824621.x1x3x22x45x23x3141x4221xx2215xx228.2abab23ABBAxxBxxA321123522224ABCDAB=4cmAD=2cmAB.25abababababababba512324322()()26500.60.8.1x22002331.2.3....11.210.21.a=ba+c=b+cac=bc.20.a=bac=bccbca3.a=bb=a.4a=bb=ca=c.1.1..242(1)2.(2).(3)1=,(4).(5)12.(6)112345.2177.131.2S=ababSS=a2aSS=hba)(21abhS2rSrS25ahS21ahS.3L=2a+babL.L=4aaL.L=2rrL.4.=.5=.6=.7.8.9==+.1_____________________.22232zxym213zxymm=____________.321)(4axaxa=_____________.416354xxx=_______________.5|m|=4mx2_______________.6S=hba)(21S=10b=2h=4a=_________.267413)12(2xxaa-______________.8200312455ax115A125B210C64D1202A;342xxB;0xC;12yxD.11xx3212xA;41xB;4xC;41xD.4x4523baA;253baB;6213baC;523bcacD.3532ba52631xxA;331xxB;336xx12345678910111213141516171819202122232425262728293031acbd27C;336xxD.331xx6A1223xx;2123xxB1523xx;1523xxC2332t1;1xD15.02.01xx.63x7323:5xA;323xxB;3253xxC;3235xxD.326xx85m50m.aAa25Ba50Ca150Da250.1xx21528312)2(572xx3143263xx4)1(32)]1(21[21xxxx285103.002.003.039.02.0xx148022cm4cm34cm12cm10cm1010cm2911231(1)2x3x+1ab2x-3ya2+b2(2)1+2=3a+b=b+as=ahc=2r4+x=7x-5=11.(a)?(b)?(c)(1)(2)?2(2)(2)(2)s=ah(2)x-5=11x511.1(1)1+2=31+2+(4)3+(4)1+2-(5)3-(5)30(1)(1)2x+3x=5x,2x+3x+(4x)5x+(4x)2x+3x-(x)5x-(x)(3)?(4)3m+5m=8m2(3m+5m)28m(3m+5m)8m(5)(4)?(3)(5)1()2()()2?(1)(3)(2)()1a=ba+m=b+m2a=bam=bmam=bm(m0)21()a=b(1)a-3=b-3(2)-a=-b(3)3a=3b(4)-a=-b(5)0a=0b?()(1)(5)?(312)2()(1)2x=5-3x2x+____=5(2)0.2x=0x=____()()3(1)5x-7=8(2)x+3=-6()(1)175x-7+7=8+75x=1525x=3(2)()1()(1)x=yx+5=y+5??(2)x=y??(3)a+2=b+2a=b??(4)-3a=-3ba=b??2(1)5x=4x+3x=3?(2)4x=12x=3?(3)a=b?(4)2r=2rr=r?1(1)?(2)?(3)?2(1)(2).x2+1=01x=y?(1)2x=2y(2)x2=