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#1
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... mathematical proofs, like diamonds, are hard as well as clear,and will be touched with nothing but strict reasoning. |
#2
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˹ѧÊ×Í Geometry ã¹àÅèÁ¢Í§ HS Hall ¡çÁÕËÑÇ¢é͹Õé¹Ð¤ÃѺ áµèàËÁÒÐÊÓËÃѺÍèÒ¹à»ç¹¾×é¹°Ò¹¨ÃÔ§æ äÁèà¹é¹¡ÒûÃÐÂØ¡µì
Êèǹ¶éÒÍÂÒ¡ä´éẺ¤ÃºÇ§¨Ã ¡çÅͧ search ã¹ google ´éÇ¡ÒþÔÁ¾ì¤ÓÇèÒ inversion áÅéǾèǧ´éÇ olympiad à¢éÒä» ¡ç¹èÒ¨ÐÁÕËÅÒ link áµè¶éÒÂѧÍèÒ¹äÁèÊÐ㨠Åͧà¾ÔèÁ¤ÓÇèÒ projective geometry à¢éÒä»´éÇ¡çä´é¤ÃѺ à¾ÃÒÐ inversion ¡çà»ç¹Êèǹ¹Ö§ã¹ projective geometry link ¢éÒ§ÅèÒ§à»ç¹á¤è sample ¤ÃѺ TRY THIS LINK
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