2008年数学中考试题分类汇编特殊平行四边形（整理） .txt

2008 1(2008) 22008差 a. b. c. d. 320081abcdpbbccddaapxabpyyx2abc a10 b16 c18 d20 42008abcd a b c d 52008 a b c d 62008 72008 a b c d 82008 abcdb60ab2efbccdaeefafaef a b c d 9(2008 )( ) a. b. c. d. 1020088cm6cm2 acm bcm c22cm d18cm 11 (2008) a. b. c. d. 12 (2008)( ) a. b. c. d. 14= a110 b115 c120 d130 152008 a bc d 162008壩abcd20cmabcdabefadghabefadgh68cm2,abcd a21cm2 b16cm2 c24cm2 d9cm2 172008abcd aab=bc bacbd cabc=90 dac=bd 18(2008)8cmabcddbc eafmncn a3cmb4cmc5cmd6cm 192008 a b c d 202008a1234 10 20 24 25 21088cm6cm2 acm bcm c22cm d18cm 22(2008 ) a b c d 23(2008 ) a. b. c. d. 242008,abcd,adbc,ad=ab,bc=bd,a=100,c=( ) a.80 b.70 c.75 d.60 12008abcdacbdoab=2.5ac 22008“125= 32008 42008 52008pabcdbdbp = bcacp 62008 7(2008) 4 82008 920082 102008abcdac,bdoaob60ab4cmac_cm 112008 1208abcdadbcaedcab=6cmae= cm. 13(2008 )cm cmcmcm cm 142008 abcdab2bc3acadbc efcece_. 1520081 16200812008 17 (2008)abcd6eadde3beacm 182008 19200832 202008abcdab=dc=3bdabcdabce 212008abcdefgheh3ef4ad_. 222008babc=_ _ 23 cm 242008(1)610(2)(1) 25abcdadbcebcdeabad1bc2ce_ 262008 272008.60_ 282008 292008abcdab8mcb4m edcbfbcdbfe 30(2008 )cmcm 31(2008 )abcd()efghefgh40cmac= cm 32(2008 )abcdooacef,adbcefce,24cmabcd cm 332008壩飬 34(08)5 . 352008abcddeabede=6cmsina=3/5abcd cm2. 12008差12bceabcdcefg.bgde. 1bgde. 2. 22008裨 abcd adbcmnmn nndbce eadf dcefab=2 32008abcabddeacbcedfbcacf 1dabc_ 2decf 420081cdeebaec3 2pbcbp=2cpepabf baf3 paepfbp4 5(2008 ),:abfc=90efbcd,abe,cf=ae (1) ,becf; (2) ,becf?. (:) 6(2008 ) 1 2 7(2008)5abcdabdc dbadcaaebdcdec2e 1abcd 2bdc30ad5cd 8200810cm10cm15cm 92008 abcdabcda=90 ab=2bc=3cd=1ead cebe 102008abcdgcdbcececgbgdef 1bcgdce 2dced90daeebgd 112008 127 2008 1 2 13200812 1 2 3 142008 1 2 152008abc oacomnbcmnbcaebcaf 1eo=fo 2oaecf 16(2008 )abcdab=4cd=9c=60pccddqddaa. 1ad 2cp=xxpdq 3bcmpdqmmbm. 17(2008 ) 1 2 182008 192008)8 15 25 202008 21(2008)abcdeadbeabe30bedebdpeedppqbdbeq (1) ped1bepdpq 2 bc6pqxpqdyy xx 3pedqcppfqcfpfbdg2pg 22 200810cm10cm15cm 23 200815 1 2 3 24 2008p1abcdacpacebcpe=pb. 1 pe=pd pepd 2ap=x, pbey. yxx xy. 252008abcdebcaeaddfaefdedfdc 262008 1 2 272008abcdeabfaddfbe cecf 1gadgce45gebegd 2abcdadbcbcadb90abbc12eabdce45be4de 282008abcdecdaebcf (1)adefce (2)acdfacfd a b c d 292008壩 30 2008abcdabcdab=2bc=3cd=1eadeceb 31(2008 ),2,4,2,5.,?,. 32(2008 )1 33(2008 ):,abcd,efbcab,ef=ed,efed.:aebad. 342008 ,abcd,ab=8,bade,bg=10. (1)fab,(1).(2)fad,(2).bgef,gf. 352008 abcd2bd=2efadcdae+cf=2. 1bdebcf 2bef 3befss. 362008abcddeabbaedfbcbcf dedf 3720081 2 382008 1 12 23 392008 1 2 3 402008p1abcdacpacebcpe=pb. 1 pe=pd pepd 2ap=x, pbey. yxx xy. 412008 abcdadbcab=dcad=2bc=4bcece=ad 1dce5 2abcddfacbd5 42(2008) 8oabdccbadgh 1 2ab=cdad=bcoa=oc 432008abcdabcda=90 ab=2bc=3cd=1cebe 442008壩10abcdad2abead ee abbcmn bmcn 452008壩14(1)abcdab=10ad=6bd=8bdab1d1cb2d2(2)ab1d1ab1(b2ab1ab1cd2)ab2ad1b2d2eb2cb1d1f (1)ab1d1(3)b2fd1e (2)b2b1xb2fd1eyyxb2fd1e (3)b1c(3)b2b1 b1b2f b1cf 4620081abcdgcd(gcd)cgabcdcefgbgdebgde 11bgde 1cefgc()23,2 24-6ab=abc=bce=ka cg=kb (abk0)(1)5 3(2)5a=3b=2k= 1d 2a 3d 4a 5c 6a 7d 8b 9d 10a 11b 12d 14b 15b 16b 17c 18a 19c 20b 21a 22d 23d 24c 15 20.6 3 42008 522.5 6 7 8 9 108cm 118 126 134 14 15 16 17 2 188 196 2015 215 2290 236 24 6060120120 25 1 26 27 28 2910m2 309 3120 3248 33 34 3560 11bg=de abcdcefg gc=cebc=cdbcg=dce=90 bcgdce bg=de 2. bcgdce bcgc90dce 2abcdab=2 nbc nc= ne=nd ce=ne-nc=, , dcef 3(1) . (2) cd deacdfbc decf dabc cdacbfcdecd fdcecd fcdfdc fcfd decf ddgabgdhbchdiaci adbdcababc di=dg dg=dh dh=di deacdfbc decf sdecf=cedh =cfdi ce=cf decf 41ecdebaec d=900 de=1ad=dea=600ceb=600 aeb=ceb=600 ebaec 2cebf= bf=2ce ab=2cebaf cp=ce=1c=900 ep= rt adeae= =2ae=bf pb=pb=pe aep=bp=900 paspfb paepfbp 1200 51becf efbc bf=fc,be=ec,12 acb=90 1+4=90 3+2=90 3=4 ec=ae be=ae cf=ae be=ec=cf=bf becf 2a=45besf a=45, acb=90 1=45 ebf=2a=90 becf 61 aas 2 1 71aebd, ebdc dbadc adc2bdc c2e adcbcd abcd 21c2e2bdc60bcad5 bcdc60, bdc30 dbc90 dc2bc10 8cm cm cm 116 9: ccfabf abcdabcda= dacfa90 afcd ad=cf, bf=ab-af=1 rtbcf cf2=bc2-bf2=8 cf= ad=cf= ead de=ae=ad= rtabe rtdec eb2=ae2+ab2=6 ec2= de2+cd2=3 eb2+ ec2=9=bc2 ceb90 ebec 101bccdbcgdce90 2 cgcebcgdce. 4 2ebgd dced90dae ceaecgcecgaeabcdabcd bedgbedg6 ebgd 8 11 121 2 轻 7 131362 3 141 2 2 151 ce mnbc 2oacaecf. oacaecf. aecf 16125-1 aaecde . de=. rtadead=. 25-2 aaebccdece=ab=4 . aed=c=60. d=c=60 aed . ad=de=94=5 . 225-1 cp=xhpd,pdqs s=pdh =(9x)xsin60 =(9xx2) =(x)2. 0x5 . x=0x5s=. 325-3 mpddq . 9x=xx=. pqpdq . qqmdcbcmm. mp