f(x)æ¯å¢å½æ°ï¼ä¸ä¸xè½´åªæä¸ä¸ªäº¤ç¹ï¼ä½ 大è´ç»ä¸ä¸å¾åï¼å°±åç°måºè¯¥æ¯éè´çæè
mçäºä¸ä¸ªè´å¼ï¼ä¸¤ä¸ªå¾åç¸åã
ç¸åçæ¶åï¼å½æ°å¼ç¸çï¼å线æçç¸ç
æ以mçèå´æ¯ä¸é¢æ±çé£ä¸ªæ°å¹¶ä¸âª[0ï¼æ£æ 穷大)