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å¦ x^2 / a^2 - y^2 / b^2 = 1 çæ¸è¿çº¿ä¸º x^2 / a^2 - y^2 / b^2 = 0 ï¼
åè§£å¾ (x/a + y/b)(x/a - y/b) = 0 ï¼
æ以æ¸è¿çº¿æ¹ç¨ä¸º x/a + y/b = 0 æ x/a - y/b = 0ã
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