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¶ä¸ x0y0 = a^2 ï¼ç± y = a^2 / x å¾ y ' = - a^2 / x^2ï¼
å æ¤å线æç k = - a^2 / x0^2ï¼æ¹ç¨ä¸º y - y0 = -a^2 / x0^2 * (x-x0) ï¼
令 x = 0 å¾åçº¿å¨ y è½´æªè· y0 + a^2 / x0 = y0 + x0y0/x0 = 2y0ï¼
令 y = 0 å¾åçº¿å¨ x è½´æªè· y0x0^2 / a^2 + x0 = 2x0ï¼
å æ¤é¢ç§¯ S = 1/2 * 2x0 * 2y0 = 2x0y0 = 2a^2 ã
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