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2.62123()4..y=ax2+bx+c(a,b,ca0)yxa=0bca.1..a0()(00)()(0)(0)()()2..(1).(2)()..3.20()yaxbxca,,abc(1).(2).()().(3).(0)...4.(1)a0..(2)a0..(.)(3)a0.().2yaxbxca0xx.(1)x(2)x(3)x.x.(1)x(2)x(3)x...(1)(2)(3)(4).()()..1.(3-2)x6(3-2)2(3)2yax2692yaxaxax6ax3x6x(00)(60)ya(x-0)(x-6)(3-2)xya(x-3)2-2(a0)2692yaxaxax(x10)(x20)212364(92)||6||aaaxxa29a22(3)29yx22493yxx(3-2)2(3)2yaxx3x6x(00)(60)(00)0a(0-3)2-229a22(3)29yx22493yxxx(00)(60)ya(x-0)(x-6)(3-2)3(36)2a29a2(6)9yxx22493yxx2442ymxmxmm12155mx10m2242mmabxmmmmabacy442444422)()(241681622mmmm)2,2(2x02442mmxmx24164(42)22222mmmmmxmm0m22xm2m155m22105m2m14924164(42)22222mmmmmxmm21m2m24m21m29m29mm221296822xxyxxy221222810999yxx2.yaxb2yaxbxc(0)aCa0a0a0a0yax+b2yaxbxcDa0b0yax+byy2yaxbxcyBa0b0yax+byy2yaxbxcyCa0yax+b2yaxbxcAababab3.xOy()334yxyAM32yxMOMA2yxbxcAM(1)AM(2)(3)ByACD334yxABCDC(1)334yxx0y3A(03)MOMAMOAM32M32yx32yx1M31,222313122AM(2)A(03)31,2M2yxbxc3,31.2cbc5,23.bc2532yxx(3)B(0m)(m3)25(,3)2Cnnn3,34Dnn|AB|3-m213||4DCDCyynn5||4ADnABCD||||||ABDCAD2133,453.4mnnmn113,0;mn221,22.mnn22532yxx2CyC224.10cm8cm()(1)48cm2?(2)?(3)?(1)xcm(10-2x)(8-2x)48x2-9x+80x18()x211cm(2)xcmycm2yxy2(10-2x)x+2(8-2x)xy-8x2+36x2981842yxx2.25y40.52.25cm40.5cm2(3)xcmycm2yx1022(82)22xyxxx213169666yx136x1696yyx822(102)22xyxxx2798633yx73x983y73cm398cm31b=________.2(1)(2)(3)yxx(4)k(1)(2).(3).(4)1x2(10)(30)(22)..522(2)2(2)xxyxxy8x()A6B4C64D46y8x.D228x6x626x6x()2x8x4D6ABC(-10)(30)(03)ABClDl(1)(2)AD+CDD(3)AADAAD+CDBDABDADABxAD+CDDDBDAADBDD(1)ya(x+1)(x-3)(03)3a(0+1)(0-3)a-1y-(x+1)(x-3)223yxx(2)BClDBAlADBDAD+CDBD+CDBCAD+CDDBCykx+bBC(30)(03)03,3.kbb1,3.kbBCy-x+3lx1x1y-x+3y-1+32D(12)(3)ADlxE(2)AD+CDD(12)DEAEBE2DABDBA45ADB90ADBDBDA(1-2)12:310CyxxCCCCx1AC52BC3CC5DC622yaxbxc5aca+b+c4a-2b+c2a+b2a-b0()A2B3C4D532yaxbxc()A0aBabc0Ca+b+c0D240bac234223yxxy180()A2(1)2yxB2(1)4yxC2(1)2yxD2(1)4yx5OAB4OO1ABMO1yAMxyx()A214yxxB214yxxC214yxxD214yxx566(30)(43)(03)a1c=3x2()A1B2C3D47yaxb(-21)23yaxbx(21)xla03()A0B1C2D3824yxxa()Ax1yxBxa4Ca3240xxa1x3D13(1-2)a-39yx223.10230xbx-3y=x2+bx-314,5y25,4y31,6yy1y2y3.11P2P2112yxPxP________111312y3x2xy3.132yaxbxc(a0)abx1x34a+b0y-2x0.14125,24xABxx4M10AMBSM152yaxbxc(a0)5abc0ba+c4a+2b+c02c3ba+bm(am+b)(ml)________()151616212yx1y2(1)y2________(2)S________(3)y2O180y3y3________________174050210l10(65)x(x)y(1)yxx(2)??(3)2200?2200?18224yxxxAm(m0)xCDP(1)APCA()(2)x?(m)(3)PCDSSm19.A(-40)B(0-4)C(20)(1)(2)MMmAMBSSmS(3)PQy-xPQBOQ20.2yaxcxF(160)yE(016)16ABCDDOAEC(1)(2)ABCDBCxABPCDQ(PABQCD)A(mn)(m0)POPFPQABCDmn7mPAB?m1.C22349:31024Cyxxx349,24C049,4x03212x072xC274924yx234924yx274924yx5C2.Aa0c0012bab0ac02a-b012ba2a+b0x1a+b+c0x-24a-2b+c0A3.Ca0c002bab0abc0x240bac4.B2223(1)2yxxx(-12)(03)180(14)2(1)4yx5.BO1MO1OOO1OO1OA-y2-yO1MyOMOA-AM2-x(2-y)2y2+(2-x)2214yxx6.C(30)(10)x2(43)(03)x2a1c=3,23yxbx(10)b-44221xx2(30)(-10)(-10)x2.C.7C(21)4231ab-2a+b1x112ba2a-b0a02243()344abbyaa20b0a204ba3y2C8C24yxxax2a10x2yxAx16-4a0a4a3x2-4x+30243yxxy0x11x23x1x3y02430xxx1x32(3)4(3)1yxxa222yxxa(1-2)3a9y(x+2)2-3yx2(00)y(x+2)2+3(-2-3)(00)23(-2-3)yx223y(x+2)2-310y1y2y3.x2+bx-30x2233cxax213112xy1y3y1y2y3b2y1y2y311(6,2)(6,2)PxP2y22112yx26x6xP(6,2)(6,2)12y3(x+3)2-3y3x2(00)xy3(00)3(-3-3)y3(x+3)2-313x(-10)(50)1522x22ba4a+b0a0b-4a01322x1x3x2y-2x0414(2-4)(-1-4)1|||4|102AMBSAB|AB|512xAB(20)(30)2yaxbxc4209301125424abcabcabc1,1,6.abc26yxxy-4246xx220xxx1-2x2-1M(2-4)(-1-4)15a0c002bab0abc0x2xx-1a-b+c0ba+cx24a+2b+c09a+3b+c012ba9302bbc2c3bx1yabcm1xm21yambmc1yy2abcambmc2()abambmmamb16(1)(12)(2)2(3)(-1-2)212yx1(02)(12)y2O180y2(12)17.(1)y(210-10x)(50+x-40)10x2+110x+2100(0x15x)(2)y-10(x-5.5)2+2402.5a-100x5.5y2402.50x15xx550+x55y-10(5-5.5)2+2402.52400()x650+x56y2400()55562400(3)y2200-10x2+110x+21002200x11x210x150+x51x1050+x60516022005160220018.(1)2240xxx10x22A(20)PCA(2)OCADmOACD2(3)0m2PHxH(,)PPPxyA(20)C(m0)AC2-m222ACmCH2222PmmxOHm22Pmx224yxx2122PymCDOA2221111222(02)2222SCDHPmmmm2PHxH(,)PPPxyA(20)C(m0)ACm-222mAH22222PmmxOH22Pmx224yxx2122PymCDOA221112()2(2)222PSCDHPymm19.(1)2yaxbxc(a0)A(-40)B(0-4)C(20)1640,4,420,abccabc1,21,4.abc2142yxx(2)MMDxDM(mn)ADm+4MDn2142nmmAMDABODMBOSSSS111(4)()(4)()44222mnnm228nm2124282mmm24(40)mmm2m4S(3)Q(-44)(4-4)(225,225)(225,225)20.[](1)2yaxcE(016)F(160)2016,16,acc1,1616.ac211616yx(2)PPGxGPF.POPFOGFGF(160)OF161116822OGOFP8P218161216yP12P(812)P12ABCD16Q-4Q2141616x185x285xm0285x85x(85,4)Q85168mn7P7P2171616x112x212x0m212xx12P(127)PAB182APABA(47)m4ABCD16B(207)C(20-9)Q2191616x120x220xm0220xx20Q(20-9)QCQCn7mPAB