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AB=a,AC=b,BE=c,CF=d(b>d)¤È¤·¤Æ
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ľÀþAD¤¬Ä¾ÀþEF¤Ëľ¸ò¤¹¤ë¾ò·ï¤ÈÅú¤¨¤Ï¡¡XMaxima ¤Ç

part(solve([y=-b*x/a+b,y=-(b-d)*x/(c+a)+b-d],[x,y]),1)$rhs(part(%o1,1))$rhs(part(%o1,2))$
-num(factor(%o3/%o2-(c+a)/(b-d)));
factor((a-%o2)/%o2);
b*c*d^2-a*c^2*d-2*b^2*c*d-2*a^2*c*d-a^3*d+b^3*c=0¤³¤ì¤òËþ¤¿¤»¤Ð¤è¤¯
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PRINT TIME$
FOR a=30 TO 50
FOR b=30 TO 50
FOR c=1 TO 50
FOR d=1 TO b-1
IF a<b AND b-d<c+a AND b<a+c AND a>c AND 2*c*d+a*d-b*c<0 AND b*c*d^2-a*c^2*d-2*b^2*c*d-2*a^2*c*d-a^3*d+b^3*c=0 THEN PRINT a;b;c;d;-c*(d-b)/((c+a)*d)
NEXT d
NEXT c
NEXT b
NEXT a
PRINT TIME$
END

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part(solve([y=-b*x/a+b,y=-(b-d)*x/(c+a)+b-d],[x,y]),1)$rhs(part(%o1,1))$rhs(part(%o1,2))$
-num(factor(%o3/%o2-(c+a)/(b-d)));
factor((a-%o2)/%o2);
b*c*d^2-a*c^2*d-2*b^2*c*d-2*a^2*c*d-a^3*d+b^3*c=0¤³¤ì¤òËþ¤¿¤»¤Ð¤è¤¯
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PRINT TIME$
FOR a=30 TO 50
FOR b=30 TO 50
FOR c=1 TO 50
FOR d=1 TO b-1
IF a<b AND b-d<c+a AND b<a+c AND a>c AND 2*c*d+a*d-b*c<0 AND b*c*d^2-a*c^2*d-2*b^2*c*d-2*a^2*c*d-a^3*d+b^3*c=0 THEN PRINT a;b;c;d;-c*(d-b)/((c+a)*d)
NEXT d
NEXT c
NEXT b
NEXT a
PRINT TIME$
END

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40 45 32 9 16/9
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AB = 30cm, AC = 35cm, ¢ÜBAC = 90ÅÙ¤Îľ³Ñ»°³Ñ·ÁABC¤Ë¤ª¤¤¤Æ,
ÊÕAB¤òB¦¤Ë20cm±äŤ·¤¿ÅÀ¤òE¤È¤·, ¤Þ¤¿, ÊÕAC¾å¤ÇAF = 28cm¤Ê¤ëÅÀF¤È¤ë.

ľÀþEF¤ÈÊÕBC¤È¤Î¸òÅÀ¤òQ¤È¤¹¤ë.
¤Þ¤¿, ľÀþEF¤ËÅÀA¤«¤é¿âÀþ¤ò²¼¤í¤·, ¤½¤Î­¤òP¤È¤¹¤ë.
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¢¤PAE¢æ¢¤PFA(Áê»÷Èæ 25:14)¤ò»È¤¦¤È, ÌÌÀÑÈ椫¤é,
¢¤DAE:¢¤DAF = (AD/AP)x¢¤PAE:(AD/AP)x¢¤PFA = ¢¤PAE:¢¤PFA = 25x25:14x14¤Ç¤¢¤ë.
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¢¤DAB:¢¤DAC = (30/50)x¢¤DAE:(35/28)x¢¤DAF = (3/5)x25x25:(5/4)x14x14 = 75:49¤È¤Ê¤ë(²ò2 -- ÁÛÄê²ò).
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