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½ºÆ©¾îÆ® Á¤¸® (Stewart¡Çs theorem), »ï°¢ÇüÀ» ³ª´©´Â ¼±ºÐÀÇ ±æÀÌ

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±×¸²°ú °°ÀÌ »ï°¢ÇüÀÇ ¼¼ º¯ÀÇ ±æÀÌ°¡ a, b, c ÀÏ ¶§, º¯ a¸¦ ±æÀÌ
n, mÀ¸·Î °¢°¢ ³ª´©´Â ¼±ºÐ dÀÇ ±æÀÌ´Â ´ÙÀ½°ú °°´Ù.

m*b^2 + n*c^2 = a*(d^2 + m*n) , (a=n+m)

µû¶ó¼­, ±¸ÇÏ°íÀÚ ÇÏ´Â ¼±ºÐ dÀÇ ±æÀÌ´Â,

d = ( (1/a)*(m*b^2 + n*c^2) - m*n )^(1/2)  ÀÌ´Ù.

¶ÇÇÑ, m=a-n À̹ǷΠmÀ» nÀ¸·Î Ç¥½ÃÇϸé,

d = ( (1/a)*((a-n)*b^2 + n*c^2) - n*(a-n) )^(1/2)  ÀÌ´Ù.

ƯÈ÷, n=mÀÏ °æ¿ì, d´Â Áß¼±ÀÇ ±æÀÌ°¡ µÈ´Ù.

*** Âü°í¹®Çå[References] ***

https://en.wikipedia.org/wiki/Stewart%27s_theorem
d = ( (1/a)*((a-n)*b^2 + n*c^2) - n*(a-n) )^(1/2)
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