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¶½Ì£¿¼¤¤ÌäÂê¤Ç¤·¤¿¡ª ³Î¤«¤Ë¡¢Æ±¤¸¤è¤¦¤Ë¤·¤Æ¤¤¤í¤¤¤íÌäÂ꤬ºî¤ì¤Þ¤¹¤Í ²òË¡¤ò¤¤¤¯¤Ä¤«½ñ¤¤¤Æ¤ª¤¤Þ¤¹ (²òË¡1) ùACD¤òDC¤ò¼´¤Ë¤·¤ÆÀÞ¤êÊÖ¤¹ ¤³¤Î¤È¤¡¢A¤Î°ÜÆ°Àè¤òA¡¤È¤¹¤ë ¢ÜADA¡¡á179¡ë¤Ê¤Î¤Ç¡¢¢ÜA¡DB¡á60¡ë ¤Þ¤¿¡¢AD¡áA¡D¡¡AD¡áDB¤è¤ê¡¢A¡D¡áDB ¤è¤Ã¤Æ¡¢ùA¡DB¤ÏÀµ»°³Ñ·Á ùA¡CD¡¢ùA¡DB¤ÏÀþÂоΤʿ޷Á¤Ê¤Î¤Ç¡¢ ÂоÎÀ¤è¤ê¡¢¢ÜDCB¡á1/2¡ë¡¡¡¡ (²òË¡2) CD¤ò°ìÊդȤ¹¤ëÀµ»°³Ñ·ÁCDE¤ò¡¢A¤ÎÈ¿ÂЦ¤Ëºî¤ë ¤³¤Î¤È¤¡¢DC¡áDE DA¡áDB ¢ÜCDA¡á¢ÜEDB¤È¤Ê¤ë¤Î¤Ç ùACD¢áùBED(¢è¥ËÊÕÔó³ÑÁêÅù) ¤è¤Ã¤Æ¡¢EC¡áED¡áEB¤È¤Ê¤ê¡¢ùBCE¤ÏÆóÅùÊÕ»°³Ñ·Á¤È¤Ê¤ë ¢ÜBCE¡á119/2¡ë ¢ÜDCB¡á60¡ë¡Ý119/2¡ë¡á1/2¡ë¡¡¡¡ (²òË¡3) ¤³¤Î»°³Ñ·Á¤Ï¡¢Àµ»°É´Ï»½½³Ñ·Á(¾Ð)¤ÈÀµ»°³Ñ·Á¤òÁȤ߹ç¤ï¤»¡¢Àµ»°É´Ï»½½³Ñ·Á¤ÎÃæ¿´¤È¤½¤ì¤ËÀµ»°³Ñ·Á¤ÎºÇ¤â±ó¤¤ÅÀ¡¢¤½¤·¤Æ¤½¤ì¤ËºÇ¤â¶á¤¤Àµ»°É´Ï»½½³Ñ·Á¤ÎĺÅÀ¤ò·ë¤ó¤ÇÆÀ¤é¤ì¤ë»°³Ñ·Á¤Ç¤¢¤ë»ö¤òÍøÍѤ·¤Æ¡¢ ¢ÜDCB¡á1/2¡ë¡¡¡¡(½ª) |
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ľÀþBC:y=-sqrt(3)*(x+2)/3,AC:y=sqrt(3)*x¤Î¸òÅÀC¤òµá¤á¤ë¤È solve([y=-sqrt(3)*(x+2)/3,y=-sqrt(3)*x],[x,y]);x=1,y=-sqrt(3) ¤³¤³¤Çtan(20¡ë)=tan(a)¤È¤·¤Æ ¸òÅÀC¤òÄ̤극¤-tan(2*a)=-2*tan(a)/(1-tan(a)^2)¤ÎľÀþCD:y=-2*tan(a)*(x-1)/(1-tan(a)^2)-sqrt(3)¤Èx¼´¤Î¸òÅÀD¤òµá¤á¤ë¤È solve(0=-2*tan(a)*(x-1)/(1-tan(a)^2)-sqrt(3),x);x=(sqrt(3)*tan(a)^2+2*tan(a)-sqrt(3))/(2*tan(a)) ľÀþBA:y=tan(a)*x,AC:y=-sqrt(3)*x¤Î¸òÅÀA¤òµá¤á solve([y=tan(a)*(x+2),y=-sqrt(3)*x],[x,y]);x=-2*tan(a)/(tan(a)+sqrt(3)),y=2*sqrt(3)*tan(a)/(tan(a)+sqrt(3)) DA^2¤ò»°Ê¿Êý¤Çµá¤á factor((-2*tan(a)/(tan(a)+sqrt(3))-(sqrt(3)*tan(a)^2+2*tan(a)-sqrt(3))/(2*tan(a)))^2+(2*sqrt(3)*tan(a)/(tan(a)+sqrt(3)))^2); 3*(tan(a)^6+2*3^(3/2)*tan(a)^5+45*tan(a)^4+4*sqrt(3)*tan(a)^3-17*tan(a)^2-2*sqrt(3)*tan(a)+3)/(4*tan(a)^2*(tan(a)+sqrt(3))^2) BD^2=(D¤ÎxºÂɸ+2)^2¤òµá¤á factor(expand(((sqrt(3)*tan(a)^2+2*tan(a)-sqrt(3))/(2*tan(a))+2)^2)); 3*(tan(a)^4+4*sqrt(3)*tan(a)^3+10*tan(a)^2-4*sqrt(3)*tan(a)+1)/(4*tan(a)^2) DA^2=BD^2¤È¤·¤ÆƱ¤¸°ø¿ô¤ò¾Ãµî¤·¤Æ (tan(a)^6+2*3^(3/2)*tan(a)^5+45*tan(a)^4+4*sqrt(3)*tan(a)^3-17*tan(a)^2-2*sqrt(3)*tan(a)+3)/(tan(a)+sqrt(3))^2= (tan(a)^4+4*sqrt(3)*tan(a)^3+10*tan(a)^2-4*sqrt(3)*tan(a)+1)¡¡º¸ÊÕ¤ÎʬÊì¤ò±¦Êդ˳ݤ±¤Æº¸ÊÕ¤Îʬ»Ò¤ò°ú¤¤¤Æ°ø¿ôʬ²ò¤¹¤ë¤È factor((tan(a)+sqrt(3))^2*(tan(a)^4+4*sqrt(3)*tan(a)^3+10*tan(a)^2-4*sqrt(3)*tan(a)+1)-(tan(a)^6+2*3^(3/2)*tan(a)^5+45*tan(a)^4+4*sqrt(3)*tan(a)^3-17*tan(a)^2-2*sqrt(3)*tan(a)+3)); -8*tan(a)*(tan(a)^3-3^(3/2)*tan(a)^2-3*tan(a)+sqrt(3)¡¦¡¦¡¦¡¦¡¦¡¦(1) ¤³¤³¤Ç¡¡tan(60¡ë)=(3*tan(a)-tan(a)^3)/(1-3*tan(a)^2)=sqrt(3)¡¡¤è¤ê sqrt(3)-3*sqrt(3)*tan(a)^2=3*tan(a)-tan(a)^3¡¡tan(a)^3=3*sqrt(3)*tan(a)^2+3*tan(a)-sqrt(3) ¤³¤ì¤È(1)¤È¤è¤ê(1)=0 ¤è¤ê¡¡DA^2=BD^2¡¡DA=BD ¤è¤ê ¢¤DAB¤ÏÆóÅùÊÕ»°³Ñ·Á¤Ç¢ÜDAB=20¡ë ¢¤EAB¤¬¢ÜABE=20¡ë,¢ÜBEA=60¡ë¤è¤ê¢ÜBAE=100¡ë ¢ÜDAE=¢ÜDAC=¢ÜBAE(=100¡ë)-¢ÜDAB(=20¡ë)=80¡ë¡¦¡¦¡¦¡¦¡¦¡¦(Åú¤¨) |
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>¢Ü£Â¤Îʬ¤±Êý¤ò£´£°¡ë¡¢£±£°¡ë¤Ê¤é¤É¤¦¤«¡¢¤Ê¤É¤È¤¹¤ë¤À¤±¤Ç²¿»þ´Ö¤â³Ú¤·¤á¤½¤¦¡Ê¡©¡Ë¤Ç¤¹¤Í¡¢µá¤Þ¤ë¤«¤ï¤«¤ê¤Þ¤»¤ó¤¬¡¦¡¦¡¦¡£ ¼«Ê¬¤Î#44807¤ÈƱÍͤʺÂɸ¤ª¤¤Ç ľÀþBD¤ÈAC¤Î¸òÅÀ¤òE(sqrt(1+tan(20*%pi/180)),0),D(0,0),B(-2,0)¤È¤¹¤ë¤È¡¦¡¦¡¦ A((sqrt(1+tan(20*%pi/180))-2)/2,tan(20*%pi/180)*(2+sqrt(1+tan(20*%pi/180))/(1-tan(20*%pi/180)^2)) BD=2 BD^2=4 ¤Ç¡¡¤³¤³¤Çtan(20¡ë)=tan(a)¤È¤·¤Æ»°Ê¿Êý¤Ç¡¡BA^2¤òµá¤á¤ë¤È factor(((sqrt(1+tan(a)^2)-2)/2+2)^2+tan(a)^2*(2+sqrt(1+tan(a)^2))^2/(1-tan(a)^2)^2); (tan(a)^2+1)^2*(sqrt(tan(a)^2+1)+2)^2/(4*(tan(a)-1)^2*(tan(a)+1)^2)¤³¤ì¤¬4(=BD^2)¤È¤¹¤ë¤È factor((tan(a)^2+1)^2*(sqrt(tan(a)^2+1)+2)^2-4*4*(tan(a)-1)^2*(tan(a)+1)^2); 4*tan(a)^4*sqrt(tan(a)^2+1)+8*tan(a)^2*sqrt(tan(a)^2+1)+4*sqrt(tan(a)^2+1)+tan(a)^6-9*tan(a)^4+43*tan(a)^2-11 tan(a)^2+1=1/cos(a)^2 sqrt(tan(a)^2+1)=1/cos(a) ¤ÇºÇ½é¤Î3¹à¤Ï (4*tan(a)^4+8*tan(a)^2+4)/cos(a)=4*(tan(a)^2+1)^2/cos(a)=4/cos(a)^5 »Ä¤ê¤Î4¹à¤Ï tan(a)^2=1/cos(a)^2-1 ¤è¤ê factor((1/cos(a)^2-1)^3-9*(1/cos(a)^2-1)^2+43*(1/cos(a)^2-1)-11); -(64*cos(a)^6-64*cos(a)^4+12*cos(a)^2-1)/cos(a)^6 ºÇ½é¤Î3¹à+»Ä¤ê¤Î4¹à¤ò°ø¿ôʬ²ò¤·¤Æ factor(4/cos(a)^5-(64*cos(a)^6-64*cos(a)^4+12*cos(a)^2-1)/cos(a)^6); -(8*cos(a)^3-6*cos(a)-1)*(8*cos(a)^3-2*cos(a)+1)/cos(a)^6¡¦¡¦¡¦¡¦¡¦¡¦(1) ¤³¤³¤Çcos¤Î3ÇܳѤθø¼°¤è¤ê¡¡4*cos(a)^3-3*cos(a)=cos(60*%pi/180)=1/2¡¡¤è¤ê¡¡8*cos(a)^3-6*cos(a)=1 ¤³¤ì¤È(1)¤Ç¡¡8*cos(a)^3-6*cos(a)-1=0¡¡¤è¤ê(1)=0 ¢¤BAD¤ÇBA=BD¤è¤ê¢ÜBAD=(180¡ë-40¡ë)/2=70¡ë¢¤BAE¤Ç¢ÜDAC=180¡ë-¢ÜABE(=40¡ë)+¢ÜAEB(=40¡ë)+¢ÜBAD(=70¡ë)=30¡ë¡¦¡¦¡¦¡¦¡¦¡¦(Åú¤¨) ¤Ç¤¢¤Ã¤Æ¤Þ¤¹¤Ç¤·¤ç¤¦¤«?¤È¤Ë¤«¤¯³Ú¤·¤¤ÌäÂꤢ¤ê¤¬¤È¤¦¤´¤¶¤¤¤Þ¤·¤¿¡£ |
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