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ͳѷ£ãĤߤܤ

߼ѤΤǡ礦ѷߤ

£áãСᣴģáãСᣳ

򤽤ơ£áãСģá᣸

ֱ߼ѤפȤΤϻϰϤǤϤʤ⤷ʤΤǡ
̤Τ⤢ꤽǤ
41ʶ 16:27:23 51399
ֿء׾ι
;ȤޤȤǤ
41ʶ 17:18:36 51400
鯤ο
CBDȤȡ
CD/BCϡtan

߼ѤꡢCAD
P顢AD˲­EAB˲­FȤȡ
AE=4*2/58/5
AF=3*3/5=9/5
tan=AF/AE=9/8
//
41ʶ 19:12:38 51401
鯤ο

ߤܤͳѷȤä̲

ABCܢADC180顢

AB*BC:AD*CD=ABCACDBP:PD
3*BC4*CD2:3

8*CD9*BC
CD/BC9/8
//
41ʶ 20:05:18 51402
鯤ο
#51402

ABCܢADC180
ϡߤܤ뤳ΤʤƤ⡢360-90-90180ǽФޤ͡
顢߼ѤߤܤͳѷȤ鷺˲򤱤Ȥˤʤޤ

41ʶ 20:13:56 51403
ǯ
#51398ޥ뤵ν񤭹ߤäΤ
ޤdzǧƤΤǤƤʤäΤǤƤޤĤδ֤ˤˤʤäƤޤ
2Ȥλѷ顢CD/BC=9/8
42ڡ 0:28:49 51404
Ȥ(8)
߼Ȥޤ
£ФȣУĤέȭϡΤޤ2cm3ʤΤǤ͡
#51402
ABCܢADC180顢AB*BC:AD*CD=ABCACD

ʬʬ餺ͤΤǤ
ģäȢ£äBȣġգ£äȣģäŤʤ褦ư
Ĥλѷդȹ⤵δब·
AB*BC:AD*CD=ABCACDȽФ櫓Ǥ͡

̸޻ԡ 42ڡ 1:12:46 51405
٥륯åĥ
ѷABCȻѷACD23
ͳѷѤ¤360٤ʤΤdzB+B180١
ѷABCȻѷACDդABAD34
ΤȤBCCDϹ⤵ˤʤΤǡ
BCCD2/33/489
ä9/8ˤʤޤ
42ڡ 5:58:21 51406
鯤ο
#51405

ABCܢADC180顢AB*BC:AD*CD=ABCACD

䤳ʬʬ餺ͤΤǤ
䢤ģäȢ£äBȣġգ£äȣģäŤʤ褦ư
䣲Ĥλѷդȹ⤵δब·
AB*BC:AD*CD=ABCACDȽФ櫓Ǥ͡

Ϥʤޤ
ŪˤϡΤ褦Τ֤Ǥ
(ŪˤϡsinѸȻѷѸ)
¼Ūˡλ¤Ū˻Ȥ󤵤ʤȲ򤱤ʤ꤬ǤϷ빽ޤ
42ڡ 6:38:42 51407
鯤ο
ʸAC4cmAD4cmϡƤ褤ȡ
42ڡ 6:56:04 51408
Ȥ
ɸB(-2,0),D(3,0),P(0,0)Ȥ
ľAB:y=4*(x+2)/3,ľAD:y=-3*(x-3)/4
θAA(-1/5,12/5)
ľAP:y=-12*x(1)
ľBC:y=-(x+2)/a,ľCD:y=a*(x-3)(âa)Ȥ
2ľθC
C((3*a^2-2)/(a^2+1),-5*a/(a^2+1))(2)
줬(1)ξˤ뤫
-5*a=-12*(3*a^2-2)=-36*a^2+24
36*a^2-5*a-24)=(4*a+3)*(9*a-8) C(6/29,-72/29)
BC=sqrt((6/29+2)^2+(-72/29)^2)=8*sqrt(5)/sqrt(29)
CD=sqrt((6/29-3)^2+(-72/29)^2)=9*sqrt(5)/sqrt(29)
CD/BC=9/8()

#51352
>ADSLǤΥ󥿡ͥåȤ(331)ΤǤ

2022ǯ42ADSLȤƤޤ!!
˭ԡ 42ڡ 10:00:00 MAIL:fttnm528@ybb.ne.jp 51409
̴
꤬Ƥ뤳ȤΤꡢ񤷤ʤ
פäΤǤդͼο޷
ɤȡˤäȵդޤ
ٻΤ桡 42ڡ 21:29:51 51410
ȤޤԤ
ȥߡȤȻפޤǤʤǤäʤޤ
43 9:00:20 51411
Ф
ABCDϱߤܤ뤫
ABC+ADC=180
sinABC=sinADCǤ
äƢABCȢADCͤBPPD=2:3
ABCADC=2:3
ȤBC=xCD=yȤ
3xsinABC4ysinADC2:3
3x4y=2:3
8y=9x
y=(9/8)xȤʤ9/8ȤʤޤȥߡȤʤä
46ʿ 20:38:18 51412

ŤƵޤǥ٥ȥDz򤭤ޤ
ǹͤˡϲΤȤꡣ
P̤ABʿԤAD,BCȤθ򤽤줾A',B'
P̤ADʿԤAB,CDȤθ򤽤줾A",D"Ȥ롣
PBC,CDز­򤽤줾H',H"Ȥȡ
ABCD梢PB'CD"ʤΤPB':PD"=3:4
B'PH'=D"PH"ʤΤǢPH'B'梤PH"D"äPH':PH"=3:4
ޤPBC:PCD=2:3 ʤ
BCPH':CDPH"=2:3 ʤΤBC:CD=8:9
ä9/8
46ʿ 23:08:13 51413