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12345.1(1)OAOA.(2)..2(1)..(2).(3).().....3(1).(2).4(1)..(2)...90...(1).(2).1POOOP=POPOPO..212nAAAO.3ORO.(1)O.(2)OO.(3)OO.4(1)..(2)...(3).(4).5.(1).(2)(3).(4).(5).1(1)I.(2)O.(3)2G.(4).(1)(2)(SPr).(3)()(1)OA=OB=OC(2)()(1)(2)OAOBOCBACABCACB(3).2(1).(2).1.R.R..R.R.(1)1(2)SR.(3)(4).ID3621791-21ABCA(13)B(22)C(42)ABC13BCxBC2412x-+=ABCx=1P(1,a)PA=PB=rPA2=PB2(1+1)2+(a-3)2=(1+2)2+(a+2)24+a2-6a+9=9+a2+4a+4a=0ABCP(1,0)22(11)(03)13rPA++-BCPABCPx=1BC10P10PAPBP2OABCDEAE1cmEB5cmDEB60CDOFCDFODAE1EB5AB632ABOA==OEOA-AE3-12RtOEFDEB60EOF30112EFOE==223OFOEEF-RtDFOOF3ODOA322223(3)6DFODOF=-=-=(cm)OFCDDFCFCD2DF26cmOFCDFRtOEFOFODRtOFDCDABACOOMABONACMNMN3BCOMABONACMNABACMNABCBC=2MN=6.3OxAByCDDAB=20OCD=65ODOB=40yEOE=130OCD=65..O2ABOPAB1OP2ABNMOCBAyxOABDC3A60B120C60120D30150C.ODABPAB1OP2OD=1OAB=30AOB=120AEB=AOB=60E+F=180F=120AB60120CID36217964ABCDOACOAOADACEFACB=DCECEO.CEOOEOE=OAOEA=OAEABCDB=D=BAD=90BCAD,CD=ABDCE+DEC=90,ACB=DACDCE=ACBDEC+DAC=90OE=OAOEA=DACDEC+OEA=90OEC=90OEECCEO.P3P(xy).(1)P.(2)x.(1).(57.5).().(57.5)().(2)..52016?RtABCC=90BDOABOOBDBCE1ACO2OB=10CD=8BE1ODBDOB=ODODBCODA2OOGBEODCGOBGBGBE=2BG1ODBDABC1=2OB=OD1=32=3ODBCC=90ODA=90ACO2OOGBCOEODCGGC=OD=OB=10OG=CD=8RtOBGBG=6OGBEOB=OEBE=2BG=12BE=126(1)((1))(2)ABO()OBOOEABEABF(2)EABFAB1232AEAB==EF2ROE(R-2)mRtAOE222(2)(23)RR=-+R4OE212OEAO=AOE60AOB120AB120481803=(m)8601603=(m2)ABABAB.AB=16cm4cm...OOCABDCOCAB.CD=4cm.xcm.RtBOD..10cm.1..2..3.4.5..6..1.2.3.4..1..2..1..2..1.1231001.100.212....1..2...1.2.1..1.2.2..1.2.3..4.....1..2.3.........12012600.2012600...20124591459180A.4591B.C.80D.80.D22016?ABCDDABCDD1,1023455.12345.32015?6012050122000400121=50=300300=10010050=5022000667667400400..A.B.C.D..B12002000120016001200200012001600600025B.42015?201533006316201532330020153113+16+25+22+20+18=11462015311423300=57003002015357005.1260.570.5370.580.5131218964848260.570.512370.580.51836037.5135.55010(t)(1)10(2)507t127t(1)6.86.546.56.56.5(2)107t7507t35610()7684908681878682858382848589798091897479(1)________________(2)________(3)13.226.36________________()(4)85(85)________________(1)8683(2)(3)(4)5040