ޥ
ǥΤ23:40᤮ȤʹӹʸϤ⤳ʤƤʤޤm(_ _)m
iMac 713ڡ 0:44:20 HomePage:46479
3N.K.
AD=AEȤʤ褦ECDˤȤꡢ
DAC˿򲼤ο­PȤ
ADP梤BAHꡢAP:DP=5:2
DP=CPꡢCP:AC=2:(2+5)=2:7
PCDεΥ1ʤΤǡADEεΥ7/2
CE=7/2*2-2=5
5*7/2*1/2=35/4
713ڡ 1:10:58 46480
鯤ο
ACBHθGȤ롣

DBADCAꡢA,B,C,DƱ߼

DBCDACABG
CDBGAB
äơDBC梤ABG
äơ
BD:DCBA:AG5:2
äơBD5cm
ACDABD;ѤơAD^22̤ɽơ򤯤ȡ
AB=7/2
äơABDѡ1/2*AB*BD*(1/2)35/4
//

713ڡ 1:11:08 46481
鯤ο
24:02˸ʬDz򤤤Ƥ顢ʤäƤʤȻפäơ긫ľ顢̤ѤäƤ
713ڡ 1:13:05 46482
baLLjugglermoka
ABDADCդ⤵5/2ADCϰդ21/47/2
713ڡ 1:16:51 46483
ޥ
ȡޤ00:09ѹʣcmȡABΤȤ5äޤˤޤʸϤäƤʤäȻפΤǤ...ߤޤm(_ _)m
iMac 713ڡ 1:18:30 HomePage:46484
鯤ο
46484
⤷顢AC=ABAC=BDɤߴְ㤨Ƥ⤷ޤ
713ڡ 1:24:21 46485
å
ACDAD򼴤ȤоΰưCΰưEȤ롣
ٴطE,C,Bľˤ뤳Ȥ狼ꡢľջѷEBCBAޤܤȤޤ֤Τοޤȹͤޤ
Ȥϡʬ椫AC=5ơ5(7/2)2=35/4
713ڡ 1:41:35 46486
ֿء׾ι
ޤǤꤳޤ
ˡϤ줫ͤޤ
713ڡ 7:13:06 46487
̴
ʬACBHθOȤȡABHAOH5:2θ夬ܤǡ
AB=5,BH=5y,AH=2yȤACD;ABH˻ʿ
Ȥ/=ʢ29/5׻35/4˻ޤ
Ūˡϳͤβٶפޤ
ٻΤ桡 713ڡ 8:25:12 46488
ˤ
ѷǸƤޤ椫Ȥޤʴ
Ķļˡ 713ڡ 9:32:38 46489

Фϡ
ޤ̵ФΤ
ƻˡͤޤ
Ѥ餺ޤ㤨ʤǤ

ޤϤ(ʤ)
ttps://www.fastpic.jp/images.php?file=2537015204.jpg

ACBHθPȤ롣
ACDᢤABEȤʤ褦EͳѷABCDγ¦ˤȤ
оΤʸ޳ѷAEBCDǤ롣
CAE˲­I, BHCIθQȤ롣
оABHACI, QHQIǤ롣
APH梤CPQ椬23 Ȥʤ뤿
ͳѷAIQHǡPHAˤPHHA25
DE֤ȢDBE90DABز­JȤ
ADE45JDBʤΤ
ADJEDBPAHBD5cm
DJB55/425/4
AJDJ25JBJDʤΤ
ABD7/5ߢJBD7/525/435/4

ͤβˡٶƤޤ
713ڡ 19:30:42 46490
ˤ⡼
Фˤ㡣

ϡ٤γ٤λȤ˶θޤ
ĤΣ٤γ٤򤢤碌ľѤȤޤԤ
ABHȹƱʻѷäꡢ
ľջѷˤǹԤޤ

HBACθȤơP
ADD¦˱ĹABHᢤCAQȤʤ褦Q֤

AHP梤AQCAHCQCQ:HP=顢AH:HP=
äơľѻѷABHΡľѤ򶴤դϣȤʤ롣

޼줿٤颤BHD梤CQD狼
BH:CQ=BD:CDᣵ顢BD=

ǡDAB˲­RȤ顢
DBRϡգľջѷ顢Ѥ25/4

DARBHA顢DRʡRBˡRAᣵäAB:RB=
뢤DABϢDBR7/5ܤȤʤ롣
äơDAB25/47/535/4
ʾ
޻Ա¶衡 713ڡ 21:25:40 46491
Ȥ
DBA=45ϻȤʤƤǤޤ

AP=2*a,PH=b,AH=sqrt(4*a^2-b^2)ǢABH梤APH
b/2=sqrt(4*a^2-b^2)/5 5*b=2*sqrt(4*a^2-b^2) 25*b^2=4*(4*a^2-b^2) PH=b=4*a/sqrt(29)
AH=sqrt(4*a^2-16*a^2/29)=10*a/sqrt(29) tan(ִ)=PH/AH=2/5
ǺɸA(-5*a,0),C(0,0),D(-sqrt(2),sqrt(2)),P(-3*a,0)Ȥȡ
sqrt(2)/(5*a-sqrt(2))=2/5 5*sqrt(2)=2*(5*a-sqrt(2)) 10*a=7*sqrt(2) a=7*sqrt(2)/10
A(-7*sqrt(2)/2,0),P(-21*sqrt(2)/10,0)
tan(CAB)=tan(90-tan(2*ִ))=(cot(ִ)^2-1)/(2*cot(ִ)) cot(ִ)=1/tan(ִ)=5/2
-tan(CAB)=(1-(5/2)^2)/(2*5/2)=-21/20
ľAB:y=-21*(x+7*sqrt(2)/2)/20,ľBH:y=-5*(x+21*sqrt(2)/10)/2 θB(-63/(29*sqrt(2)),-147/(29*sqrt(2)))
ľDB:y=(sqrt(2)+147/(29*sqrt(2)))*(x+sqrt(2))/(-sqrt(2)+63/(29*sqrt(2)))+sqrt(2) y=0Ȥ
ľDB,ACθxɸ-42*sqrt(2)/41줫AxɸΤդ-42*sqrt(2)/41+7*sqrt(2)/2=203/(41*sqrt(2))
˹⤵sqrt(2)-Byɸ=sqrt(2)+147/(29*sqrt(2))ݤ2dz(203/41+147*203/(41*29*2))/2=35/4()
˭ԡ 713ڡ 22:22:21 46492
ǯ
Dz򤳤ȴĥäơפڤޤ
ADBCθͤ顢ݤʤäƤޤǤ򤱤
ɤϱ߼ѤȤäƿؤǡ
ϰսФƤľջѷФƤʿޤưƲ򤭤ޤ
715ڡ 1:52:28 46493
ȤޤԤ
㤴ޤ򤤤äƤˡ202129ľѻѷФƤޤ
715ڡ 19:11:29 46494
٥륯åĥ
ˤ˲ˡͤƤ뤦̲äƤޤ줫餤˻ƺˤʤäƤޤޤ񤷤֤ƤȤ
£ľˣ¤2ġǤȤģäȹƱʻѷꡢˣĤФƣäоΤáǤȤȡáġǤխãáǤǤ˭£äľջѷˤʤޤ
£ȢУȤ52£ȡȣ52ģäǣĤä˿򲼤ƣȤȤȣȡģȡȣá522ȤʤꡢƱʭģáǤѶ224ߡ7/2ˡ3.5Ȥʤޤ
ģäѤ3.5դáǣĤȤ2ʤΤǹ⤵3.5ȤʤꡢľջѷáǣĤգ£áǤ7Ѥ3.57212.25äƭģäѤ12.25-3.58.75Ȥʤޤ
717ʷ 23:01:40 46495
Ϸ
£ãĤߤܤΤϿ¬Ǥޤ
˿ʤʤΤǺޤޤ
η̣£ĤѤλäꤹΤǡؿʤߤޤ

ãĤ򼴤˲žä¤˽Ťͤޤ
ĤΰưҤȤޤ
ңĤϣգѷȤʤޤ
ңĤ˿ߤӤȤޤ
ӤϣңĤǤ
ӡӣ¤ʤΤ
ߣࣲ᣸Ȥʤޤ

£ġᣵˤĤƤϡֻ鯤ο͡ʣˡפǼޤ
£У梤£ãġʤΤǤ
718ʲС 8:52:53 MAIL:takaaki-k@aqr.bbiq.jp 46496