设ç´çº¿æ¹ç¨ä¸ºy+1/3=kx
代å
¥æ¤åæ¹ç¨å¾X^2+2Y^2=2ï¼
x^2+2(kx-1/3)^2=2
(1+2k^2)x^2-4/3kx-16/9=0
ABçä¸ç¹åæ 为ï¼(x1+x2)/2,(y1+y2)/2)
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x1+x2=4/3k/(1+2k^2)
(x1+x2)/2=2/3k/(1+2k^2)
(y1+y2)/2=[k(x1+x2)-2/3]/2
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