1ï¼è¿å x^2+y^2=r^2 ä¸ä¸ç¹P(mï¼n)çå线æ¹ç¨ä¸º
mx+ny=r^2 ï¼
2ï¼è¿å (x-a)^2+(y-b)^2=r^2 ä¸ä¸ç¹Pï¼mï¼nï¼çå线æ¹ç¨ä¸º
(m-a)(x-a)+(n-b)(y-b)=r^2 ï¼æåæ (m-a)(x-m)+(n-b)(y-n)=0 ï¼
3ï¼è¿æ¤å x^2/a^2+y^2/b^2=1 ä¸ä¸ç¹Pï¼mï¼nï¼çå线æ¹ç¨ä¸º
mx/a^2+ny/b^2=1 ï¼
4ï¼è¿åæ²çº¿ x^2/a^2-y^2/b^2=1 ä¸ä¸ç¹Pï¼mï¼nï¼çå线æ¹ç¨ä¸º
mx/a^2-ny/b^2=1 ï¼
5ï¼è¿æç©çº¿ y^2=2px ä¸ä¸ç¹Pï¼mï¼nï¼çå线æ¹ç¨ä¸º
ny=p(x+m) ã
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