1、= I k k s1./ m m ( )A B C D2. m AB = AD5F/ BHq E ABCADC ( )A. BAC = DAC B. BCA = DCA C. CB = CD D. B = D = 903./ ( )A. a(a b) = a2 ab B. (2ab)2 +a2b = 4abC. 2ab 3a = 6a2b D. (a 1)(1 a) = a2 14./ E ( )A. T 5 A 1 LmB. T 1 L * C.% 1HLmD.BHL1VL Lm5. mAB = CDAD = BCVOLADEBCFm ( )A. 4B. 5C. 6D. 76. mRtABC
2、ACB = 90A = 50| | PA HCB A)|CD5ADB =( )A. 40 B. 30 C. 20 D. 107.9 ( 23)20031:52002 ( 1)2004T ( )A. 23 B. 32 C. 23 D. 328. m U M0 BC = EFPH0ACH0 Z_DFM5/ 1AB = DE 2ABC+DFE =90 3ABC = DEF ( )A. 1B. 2C. 3D. 09. Tx2 +6x+k2 z B T Z * k( )A. 3 B. 3 C. 3 D. 910. mABC HABBCCAsY 203040 H sL|ABCs 5SABO : SBCO
3、: SCAO( )A. 1 : 1 : 1 B. 1 : 2 : 3 C. 2 : 3 : 4 D. 3 : 4 : 511. mXACB = 60PC = 12MNHCB PM = PN MN = 35CM( )A. 3 B. 3:5 C. 4 D. 4:512. mABCABC = 45CD ? ABDBE sABC OBE ? ACECDMFDH ? BCHBEG/ BD = CD AD +CF = BD 2CE = BF AE = BG ( )A.B.C.D.13. P (a+2;3)Q( 1;b+1)1y5ab =14. mABCAB = AC = 10DE:BF = CN;FBD
4、= DCN;DB = DC;)BDFCDN (SAS) BDF = CDNDF = DN MDN = 60) BDM +CDN = 60) BDM +BDF = 60DMNDMF8:DM = MD;FDM = MDN;DF = DN;)DMNDMF (SAS) MN = MF = MB +BF = MB +CN)AMN AM +AN +MN = AM +MB +CN +AN = AB +AC = 618.12 5iAP = t cmBQ = t cmABCAB = BC = 3 cmB = 60) BP = (3 t)cmPBQBP = 3 tBQ = tPBQ 5BQP = 90BPQ =
5、90BQP = 90 HBQ = 12 BPt = 12 (3 t)t = 1(s) BPQ = 90 HBP = 12 BQ3 t = 12 tt = 2(s)st = 1 st = 2 s HPBQ 19.(1)(3x2y)2 ( 15xy3) ( 9x4y2)=9x4y2 ( 15xy3) ( 9x4y2)=15xy3:(2)(2a 3)2 (1 a)2=4a2 12a+9 1+2a a2=3a2 10a+8:(3)(2+x)(2 x)+(x 1)(x+5)=4 x2 +x2 +4x 5=4x 1:x = 32 H T= 4 32 1= 6 1= 5:20.ABDCBD8:AB = CB
6、;AD = CD;BD = BD;)ABDCBD(SSS)ABD = CBD)BD sABCOE ? ABOF ? CB)OE = OF21.(1) ABC = 90) ABC = CBF = 90RtABERtCBF8:ADE = BFE;AED = BEF;AE = BE;ADEBFE(AAS)(2) EGDF1“ EG:AB = AE;EAO = NAB;DA = AO;)ABDAEO(SAS) BD = OE(3)TEH ? ABH AE = BE) AH = 12 AB BO = 12 AB) AH = BORtAEHRtBAO8:EHF = DAF;EFH = DFA;EH = AD;)HFEAFD(AAS) EF = DF) FDE
