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2019-202010,4,4013A.31B.3C.31D.32x2x()Ax2B.x2C.x2D.x23A236aaaB11()22C164D|6|640.321000A.2102.3B.3102.3C.4102.3D.21032.05A.1B.2C.3D.46A.B.C.D.7.3cm18cm2A.6cmB.4cmC.33cmD.3cm8.:1,3,3,0,2,3,3,A.0B.1C.2D.39.Py-2x+4=0OOP(5)6(10)QA.2B.25C.554D.55810ABCDAB=3AD=5.ABCAPQ,ABCPQPQABADABCA.1B.2C.3D.465301134xx.12357.13.4-2x1.14.345682469315AOBB-20C20lAODABEEADEDCO.16.11S111222134n(n3)SnSn-1Sn=.201111.12.13..12345678910l(15)(16)1234CBA14..15..16..8,17208,2110,22,2312,2414,80171230tan3)2(0o18412222aaaaa=319,ABC,A=B=30,CCDACABD.(1)ADCO(2)BCADC2020104147.15201A____________________23500300212010(CD)0.3m(BE)0.2mA91ACA4B7.5MNPQ0.1sin90.16cos90.99)22AB450ABB1Ayx1yxx2623.OMNPQMNO,PMNQ,PMOQNO.ABCDxy4501045OFCEDABDCEBCBAEEAFAFDCFABAFCFDEBCEBADEABEEC12BAEEDFCFABAB4CF2DF242yaxbxc0axAB(AB)yC12,33,12(1)(2):lykx0kBCD(BC)lBODBACD(3)PPCOACO()PxCCDABACBCB0153x433n43171+31842aa=3=131920211AC=52AP=3.454,.221y=-90x+9005x10260/231AB=AF+CF(2)DF=6241y=ax-12+k12163kaka41-kay=x-12+4=-x2+2x+32ODACBODBACBABOBCBD4323BDBD=429CBO=OCB=450BE=DE=49D4349xyl3:ODB=ABODBCACABBOBBD2334BDBD=22CBO=OCB=450BE=DE=2D12xyl2:32AyFF10CEy=-3x+3CEP5-12PCO=ACOPCO=900PCx=1P232x5PCOACOx=5PCOACOx5PCOACO