<P>1. (2+<COMMENT class=MATH>[0]#wh4/5.1`4.9/11,[1]{sqrt{3}}</COMMENT>)^2=an+bn<COMMENT class=MATH>[0]#wh4/5.1`4.9/11,[1]{sqrt{3}}</COMMENT> (´Ü, an,bnÀº À¯¸®¼ö)ÀÌ°í an^2-3bn^2=1À» ¸¸Á·ÇÒ ¶§ (an-bn<COMMENT class=MATH>[0]#wh4/5.1`4.9/11,[1]{sqrt{3}}</COMMENT>)^2005ÀÇ °ªÀ» ±¸ÇÏ¿©¶ó.</P> <P> </P> <P>2. ¹«¸®¼ö <COMMENT class=MATH>[0]#wh4/7.4`9.6/11,[1]{sqrt{{{n}#{}}}}</COMMENT>ÀÇ Á¤¼öºÎºÐÀ» a, ¼Ò¼öºÎºÐÀ» b¶ó°í ÇÒ ¶§, a^3-9ab+b^3=0À» ¸¸Á·ÇÑ´Ù. ÀÚ¿¬¼ö nÀÇ °ªÀ» ±¸ÇÏ¿©¶ó.</P> <P> </P> <P>3. ÀÌÂ÷ÇÔ¼ö f(x)=x^2+ax+bÀÇ ÃÖ¼Ò°ªÀ» mÀ̶ó ÇÏÀÚ. f(x)°¡ 0<COMMENT class=MATH>[0]#wh4/4.2`4.4/11,[1]{`leq`}</COMMENT>f(x)<COMMENT class=MATH>[0]#wh4/4.2`4.4/11,[1]{`leq`}</COMMENT>5, 1<COMMENT class=MATH>[0]#wh4/4.2`4.4/11,[1]{`leq`}</COMMENT>f(1)<COMMENT class=MATH>[0]#wh4/4.2`4.4/11,[1]{`leq`}</COMMENT>3À» ¸¸Á·ÇÒ ¶§, mÀÇ ÃÖ´ë°ª, ÃÖ¼Ò°ª°ú ±× ¶§ÀÇ xÀÇ °ªÀ» ±¸ÇÏ¿©¶ó.</P> <P> </P> <P>4. xy ÁÂÇ¥Æò¸é¿¡¼ xÃà À§¿¡¼´Â ¸ÅÃÊ 2mÀÇ ¼Ó·ÂÀ¸·Î ¿òÁ÷ÀÌ°í, ±× ¿ÜÀÇ Á¡¿¡¼´Â ¸ÅÃÊ 1mÀÇ ¼Ó·ÂÀ¸·Î ¿òÁ÷ÀÌ´Â Á¡ P°¡ ÀÖ´Ù. ¿øÁ¡¿¡¼ Ãâ¹ßÇÏ¿© óÀ½ 1Ãʵ¿¾È¿¡ Á¡ P°¡ µµ´ÞÇÒ ¼ö ÀÖ´Â ¿µ¿ªÀÇ ³ÐÀ̸¦ ±¸ÇÏ¿©¶ó. </P>