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5^2+x^2-10x*cos60¡ë=x^2+4x^2+4x^2*cos60¡ë
6x^2+5x-25=(2x+5)(3x-5)=0
x=5/3
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¡¡¡¡ 7·î2Æü¡Ê¶â¡Ë 21:45:47¡¡¡¡ ¡¡¡¡36421
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A(-5,0),Q(0,0),C(2*a,0),P(-a/2,-sqrt(3)*a/2)¤ÈÃÖ¤¯¤³¤È¤Ë¤·¤¿¡£
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e1:-sqrt(3)*a/2=k*-a/2+l$
e2:0=k*-5+l$
solve([e2,e3],[k,l]);k=sqrt(3)*a/(a-10),l=5*sqrt(3)*a/(a-10)
ľÀþAP:y=sqrt(3)*a*x/(a-10)+5*sqrt(3)*a/(a-10)
¤³¤ì¤Èx^2+y^2=25¤È¤Î¸òÅÀ¤¬B¤Ê¤Î¤Ç¤½¤ì¤òµá¤á¤ë¤È
e3:y=sqrt(3)*a*x/(a-10)+5*sqrt(3)*a/(a-10)$
e4:x^2+y^2=25$
solve([e3,e4],[x,y]);x=-(5*a^2+50*a-250)/(2*a^2-10*a+50),y=(5*sqrt(3)*a^2-50*sqrt(3)*a)/(2*a^2-10*a+50)
¤³¤ÎÅÀ¤È(2*a,0)¤È¤Îµ÷Î¥¤Ï
factor((2*a+(5*a^2+50*a-250)/(2*a^2-10*a+50))^2+(0-(5*sqrt(3)*a^2-50*sqrt(3)*a)/(2*a^2-10*a+50))^2);
25*(a-10)^2/(a^2-5*a+25)¡¡¤è¤ê
5*(10-a)^2/sqrt(a^2-5*a+25)
ÅÀB¤È(-5,0)¤È¤Îµ÷Î¥¤Ï
factor((-5+(5*a^2+50*a-250)/(2*a^2-10*a+50))^2+(0-(5*sqrt(3)*a^2-50*sqrt(3)*a)/(2*a^2-10*a+50))^2);
(4*a^4-10*a^3+225*a^2-625*a+625)/(a^2-5*a+25)¡¡¤è¤ê
sqrt(4*a^4-10*a^3+225*a^2-625*a+625)/sqrt(a^2-5*a+25)
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(2*a+5)^2=25*(a-10)^2/(a^2-5*a+25)+(4*a^4-10*a^3+225*a^2-625*a+625)/(a^2-5*a+25)-(5*(10-a)/sqrt(a^2-5*a+25))*(sqrt(4*a^4-10*a^3+225*a^2-625*a+625)/sqrt(a^2-5*a+25))
¤³¤ì¤òmupad light 2.5.3 ¤Ç²ò¤¯¤È
solve((2*a+5)^2=25*(a-10)^2/(a^2-5*a+25)+(4*a^4-10*a^3+225*a^2-625*a+625)/(a^2-5*a+25)-(5*(10-a)/sqrt(a^2-5*a+25))*(sqrt(4*a^4-10*a^3+225*a^2-625*a+625)/sqrt(a^2-5*a+25)),a);
a=10(ÉÔŬ),5/3¡¦¡¦¡¦¡¦¡¦¡¦¡ÊÅú¤¨¡Ë
Ë­Àî»Ô¡¡¡¡ 7·î4Æü¡ÊÆü¡Ë 14:37:17¡¡¡¡ MAIL:fttnm528@ybb.ne.jp ¡¡¡¡36422
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¡¡¡¡ 7·î14Æü¡Ê¿å¡Ë 0:57:53¡¡¡¡ ¡¡¡¡36425
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