ç¨å®ä¹è¯ææéé½æ¯æ ¼å¼çåæ³ï¼ä¾æ ·ç»è«è¦å°±æ¯ï¼é |x-1/2|4ï¼æ |x-1| > 1/2-|x-1/2| > 1/2-1/4 = 1/4ãä»»æç»å®Îµ>0ï¼è¦ä½¿ã|x/(x-1)-(-1)| = 2|(x-1/2)/(x-1)| = 2|x-1/2|/|x-1| < 2|x-1/2|/(1/4) = 8|x-1/2| < εï¼åªé¡» |x-2| min{ε/8,1/4}ï¼å δ(ε) = min{ε/8,1/4} > 0ï¼åå½ 0< |x-1/2| < δ(ε) æ¶ï¼å°±æ |x/(x-1)-(-1) <= 8|x-1/2| < â¦< ε ï¼æ ¹æ®æéçå®ä¹ï¼å¾è¯ã
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