设Aç¹åæ (x1,y1),Bç¹åæ (x2,y2)ï¼åï¼
x1+y1=1 (1)ã交ç¹æ»¡è¶³ç´çº¿æ¹ç¨ã
x2+y2=1 (2)ã交ç¹æ»¡è¶³ç´çº¿æ¹ç¨ã
a*x1^2+b*y1^2=1 (3)ã交ç¹æ»¡è¶³æ¤åæ¹ç¨ã
a*x2^2+b*y2^2=1 (4)ã交ç¹æ»¡è¶³æ¤åæ¹ç¨ã
(x1-x2)^2+(y1-y2)^2=(2(â2))^2 (5)ã两ç¹é´è·ç¦»å
¬å¼ã
((y1+y2)/2-0)/((x1+x2)/2-0))=â2/2 (6)ãæçå
¬å¼ã
以ä¸å
±6个æ¹ç¨ï¼6个æªç¥æ°ï¼a,b,x1,x2,y1,y2
(1)+(2),代å
¥ï¼6ï¼ï¼å¾ï¼x1+x2=4(â2-1)
(1)-(2),代å
¥ï¼5ï¼ï¼å¾ï¼(x1-x2)^2ï¼4
解以ä¸ä¸¤å¼ï¼å¾ï¼
x1=3-â2,x2=1-â2 æx1=1-â2ï¼x2=3-â2ï¼
代å
¥ï¼1ï¼åï¼2ï¼ï¼
å¾å°y1=â2-2,y2=â2 æ y1ï¼â2 ,y2=â2-2
代å
¥ï¼3ï¼åï¼4ï¼ï¼å¾a=1/3,b=â2/3
ç麻ç¦åï¼
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