mhayashi
ޤ֤Ǥ͡
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ѥ
ADǢABDޤ֤ơ7-25cmǤ͡
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ABDADˤĤޤ֤ƽ夬ꡣ

ǶդʤʤäƤʲ
Ƭβž٤
̤̪ 526ڡ 0:06:32 MAIL:ishizaki@qa.so-net.ne.jp 25139
ߤ
£ĤգĤޤ֤գþ¤ŤʤΤǡŤȤ롣
ȢţģäջѷˤʤΤǣţáţġ£Ĥţáᣲ
ŤϣݣᣵȤʤ롣
526ڡ 0:08:04 25140
chitacu
äȤã
ޤ֤ưФǤ
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оϩ
ͤƱˡǡޤ֤Ʋ򤭤ޤ
ջѷ˵դΤ˻֤ݤäƤޤä櫡ġorz
γ 526ڡ 0:10:45 MAIL:pctakada@mail.goo.ne.jp HomePage:Ĥ줭25142

ʿ޷ջѷ
526ڡ 0:11:40 25143
chitacu
äȤã
ޤ֤ưФǤ
526ڡ 0:12:18 MAIL:t_tomohiro@hotmail.com 25144

ʿ޷ջѷ
526ڡ 0:12:39 25145
ҡΤ
Ϥ...ޤ֤аȯäΤorz
ѤʬȤޤäƲ򤭤ޤʶС
ǶƬǤʤäƤ...ΰ̣ΤȤ㤤
9ߤ濴 526ڡ 0:12:58 HomePage:25146
manabu
ʻѷ
526ڡ 0:18:24 25147
Ҥܤ
٤줿
ĤǶƱ褦ܤˤΤˡĤ
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Ƹ
οޤ򸫤ƤȡѣʬƤȤޤ֤
ȸäƤߤ˻פޤ͡
εβή 526ڡ 0:26:23 25149
ޥ
줫鵢ǤĤΤ褦˵ݤǤ
Τϡ̤οͤˤϷ빽ऺȻפǤġǤ
526ڡ 0:32:26 25151
Ҥܤ
¤5cmǡģä2.8cm顢ºݤοޤ񤤤Ƥߤȡ
ʡʡʤοޤΤϡ
526ڡ 0:41:59 25152
Ȥ
Τ褦ޤ֤Ȥ餷ˡˤ
ʲΤ褦ˤȤǤʤǡ
褺ѤʬAB=x,CD=yȤ
x/7=2/y
ޤդǢABD=2*ACD
ACD=ȤƢABD=2*
ޤǢABCǢABD,ACDǤ줾;Ȥä
cos(2*)=2*(cos())^2-1=(x^2+(2+y)^2-7^2)/(2*x*(2+y))
cos()=((2+y)^2+7^2-x^2)/(2*(2+y)*7)
ȭȤ
2*(((2+y)^2+7^2-x^2)/(2*(2+y)*7))^2-1=(x^2+(2+y)^2-7^2)/(2*x*(2+y))
ȭȤϢΩ
e1:x/7=2/y$
e2:2*(((2+y)^2+7^2-x^2)/(2*(2+y)*7))^2-1=(x^2+(2+y)^2-7^2)/(2*x*(2+y))$
solve([e1,e2],[x,y]);
(%i1) e1:x/7=2/y$
(%i2) e2:2*(((2+y)^2+7^2-x^2)/(2*(2+y)*7))^2-1=(x^2+(2+y)^2-7^2)/(2*x*(2+y))$
(%i3) solve([e1,e2],[x,y]);
(%o3) [[x=-7(Ŭ),y=-2(Ŭ)],[x=5(),y=14/5],
[x=2,y=7](޼B,D,Cľ˾äƤʤΤԲ),
[x=-(SQRT(137)-9)/2(Ŭ),y=-(SQRT(137)+9)/2(Ŭ)]
[x=(SQRT(137)+9)/2,y=(SQRT(137)-9)/2(޼AB+AC=BCԲ)
[x=-SQRT(13)*%I-1(Ŭ),y=SQRT(13)*%I-1(Ŭ)],
[x=SQRT(13)*%I-1(Ŭ),y=-SQRT(13)*%I-1(Ŭ)]
¤ˤޤˡǤη׻ǽϤ
ޤֻФʤΤ
ʤʤ򤤤ǤĤ⡣Ǥϡ
˭ԡ 526ڡ 1:04:52 MAIL:fttnm528@ybb.ne.jp 25153
ҤȤ
ޤ֤ʳˤ⤤ϤꤽǤ
㤨CBαĹEȤꡢջѷAECȡ
٤δط顢AEBȢAEDջѷǤ
äABEB725Ȥʤޤ
526ڡ 1:21:19 MAIL:h-wada@cream.plala.or.jp 25154
Ȥ
٤ϼ׻
褺ѤʬAB=x,CD=yȤ
x/7=2/yy=14/x
ޤդǢABD=2*ACD
ACD=ȤƢABD=2*
ޤǢABCȤä
7/sin(2*)=(2+y)/(sin(-3*))=x/sin()
μξ¦7/sin(2*)=x/sin()x*sin(2*)=7*sin()
x*2*sin()*cos()=7*sin()2*x*cos()=7cos()=7/(2*x)
μκ¦(2+y)/(sin(-3*))=x/sin()
(2+y)/(sin(3*))=x/sin()x*(sin(3*))=(2+y)*sin()
x*(3*(sin())-4*(sin())^3)=(2+y)*sin()x*(3-4*(sin())^2)=2+y
x*(3-4*(1-cos())^2)=2+yȭȤ
x*(3-4*(1-(7/(2*x))^2))=2+yȭȤ
x*(3-4*(1-49/(4*x)^2)=2+14/xx*(3-4+49/x^2)=2+14/xx*(-1+49/x^2)=2+14/x
-x+49/x=2+14/x μξդxݤơ-x^2+49=2*x+14
x^2+2*x-35=0 򤤤
x=5(),-7(ĹŬ)
˭ԡ 526ڡ 2:15:41 MAIL:fttnm528@ybb.ne.jp 25156
ϥ饮㡼ƥ
Ϥ褦ޤ
̶彣 526ڡ 7:25:40 HomePage:ĩ25157
uchinyan
ϤϤ褦ޤ
Ϥ䤵Ǥ͡
ABD AD ˴ؤޤ֤ơB б E Ȥȡ
E AC ˤΤꡢAB = AE٤δط顢EC = ED = BD = 2 cm
äơAB = AE = AC - EC = 7 - 2 = 5 cm
ͥνȡ 526ڡ 8:45:23 MAIL:uchi@sco.bekkoame.ne.jp 25158
tapu
äȤäʤäǤ
526ڡ 9:14:59 25159
kasama
Ϥ褦ޤ
ѴؿȤޤǤ_)äơʿޤǤϡȲʸ򤷤Ƥޤ
526ڡ 9:56:45 25160
ߤä
ˤȤˤ㡢٤ʤ顢񤤤ꤻ˲򤱤ޤ
526ڡ 11:53:07 25161
ʸ

ޤ޷
ιԤ鵢äƤޤ
ꥢ륿Dz򤭤ä
(B)äΤǡޤϤϤäƤޤ
526ڡ 12:13:21 MAIL:kyorofumi@msn.com HomePage:ʸ25162
taku
ꥢ륿໲äǤǰ
ϥĥ
526ڡ 13:17:30 MAIL:takuo@kcv.ne.jp 25163
uchinyan
ǼĤ򤶤äɤߤޤ
ޤ֤βˡȤƤϡAD ˴ؤ ACD ޤ֤Ƥ⤤Ǥ͡
ޤ֤ǤϤʤ#25154 ҤȤ βˡ⤪Ǥ
#25146 ҡΤ #25145 βˡˤⶽ̣Τɡ
ʤΤ̲ġϡΤǤ褯ʤǤ

ABC ʬAC Ȥθ EAD Ȥθ F Ȥޤ
BDF ˤơBDF = ACD + CAD = ABF + BAF = BFD ʤΤǡBF = BD = 2 cm
EBC ˤơEBC = ECB ʤΤǡEC = EB = BF + EF = 2 + EF
ǡAE = AC - EC = 7 - (2 + EF) = 5 - EF Ǥ
ABEACB ˤơBAE = CABABE = ACB ʤΤǡABE ACB Ȥʤꡢ
AB/AC = BE/BC = AE/AB ǡBC = BD + CD = 2 + CD ꡢϡAB/7 = (2 + EF)/(2 + CD) = (5 - EF)/AB Ǥ
ABC ˤơBAD = CAD ʤΤǡAB/AC = BD/CD ǡϡAB/7 = 2/CD Ǥ
ǡAB = x, CD = y, EF = z Ȥ򤯤ȡǰʤ x Ȥʤꡢx > 0 ꡢx = 5 Ȥʤޤ
äơAB = 5 cm Ǥ

ʤǽ˻פäˡġ󡢴ְ㤤Ǥ (^^;
̤ϡäƤޤ鶲
ޤ򸫤ƤơĤγ٤֤γ٤Ȥäɤʤ롩Ȼפޤ
ξϡ = = 36٤ǤȡABD DCA CAB ջѷˤʤޤ
ȡBC = AC = 7 cmAB = AD = DC = BC - BD = 7 - 2 = 5 cm Ǥ
ϡCD = 14/5 cm ʤΤǡABC = 2 * (֤γ) > 90٤ȤʤꡢʿޤϤޤ
󼨤줿ޤΤǤʤȡѤϢۤ⤷Ƥޤäꡥ^^/
ͥνȡ 528ڡ 9:35:54 MAIL:uchi@sco.bekkoame.ne.jp 25164
ޥ
ȡޤ˴ؤƤϡƴФ㤦褦ʿ顢äΤˤ褦פȻפäưտŪˤäƤߤޤäȤꤹǤ礦(^^;;ޤ硢ޤޤǤϡ֢ޤΤȤϸ¤ޤפȤĤƤΤǤ꼫ΤñޤʡȻפäƤƤĤޤǤϥm(__)m
MacOS X 526ڡ 15:58:31 MAIL:masaru-y@kt.rim.or.jp HomePage:25165
uchinyan
ʤΤ⤢ޤ͡
ABD A 濴 AB AC ˽ŤʤޤDzžޤBD ΰư򡢤줾 EF Ȥޤ
ADCAFC ˤơDAC = DAB = FACAD = AFAC̤ʤΤǡADCᢤAFC
ǡACD = ACF ˤʤꡢEFC = FEA - FCA = DBA - ACD = ACD = ECF ǡEC = EF = BD = 2 cm
äơAB = AE = AC - EC = 7 - 2 = 5 cm
ͥνȡ 526ڡ 19:02:51 MAIL:uchi@sco.bekkoame.ne.jp 25166
uchinyan
ޤݤʤǤ⤦ġ
A BC ˡC AD ʿԤ E Ȥޤ
ȡADCE ʿԻշǡDAC = ECAACD = CAEAEC = ADCAD = EC Ǥ
ADC = BAD + ABD > CAD + ACD = ADB ʤΤǡCEF = ADB Ȥʤ褦ˡ F AC ˤȤޤ
EFCABD ˤơEC = ADECF = DAC = BADCEF = ADB ꡢEFCᢤABD
ǡEFC = ABDFEA = EFC - FAE = ABD - ACD = ACD = FAE ʤΤǡFA = FE = BD = 2 cm
äơAB = CF = AC - AF = 7 - 2 = 5 cm
ͥνȡ 526ڡ 22:50:10 MAIL:uchi@sco.bekkoame.ne.jp 25167
M.Hossie
Фˤ㡣Τϴñޤ֤ư㤷ޤǤ͡
ܸƤƵäޤŷͽϳ餷ŷ˷äޤޤ˥ܤΤʤ麣˹ԤäΤǤϥСե꤬ͭޤǤƻ 48,000 ߤϽФޤ󡦡
ϡ 526ڡ 23:01:29 25168
⡼ޥ
HossieƱ¦λѷޤ֤ȡѷΤǡݣᣵդƱȤʬޤ͡
ޤ˽Ƥʤ
526ڡ 23:53:01 MAIL:kennji72001@yahoo.co.jp 25169
⡼ޥ
ѷǤʤջѷδְ㤤
ϵסˤΤĤޤߤ˰ߤ˽Фͽꡣ
ŷϯʤ褦ǰ
526ڡ 23:56:54 MAIL:kennji72001@yahoo.co.jp 25170
smht
ͤ줿
527ʶ 15:42:02 MAIL:settosan@hotmail.com 25171
Ҷ˥ޥ
7-2=5ǽǤ硣ñ
527ʶ 21:23:03 25172
1647
ͤ񤷤ä
ԡ 528ڡ 11:31:10 25173
0033
ñǤ
ԡ 529 11:56:51 25174
makokon
ջѷǼΤʡʤɤȹͤΤϤޤä
531ʲС 0:02:54 25175
г
ǸΤۤ㤵˼äƤäɡȤ򤱤
531ʲС 21:11:36 25176
N.Nishi
ܤDz򤱤ޤ
531ʲС 22:07:20 25177