ä¸ãæéå°æ°ååæ°ï¼æè¿ä¸ªæ°çå°æ°ç¹å»æä¹ååååï¼è¥æ¯ä¸ä½å°æ°ï¼å°±ç¨10å
åæ¯ï¼è¥æ¯ä¸¤ä½å°æ°ï¼å°±ç¨100ååæ¯ï¼è¥æ¯ä¸ä½å°æ°ï¼å°±ç¨1000ååæ¯â¦â¦è½çº¦åçå约åãå¦
0.3=3/10ï¼
0.28=28/100=7/25ï¼
1.125=1125/1000=9/8
äºãæ´æ°é¨åæ¯0ç纯循ç¯å°æ°ååæ°ï¼ç¨ä¸ä¸ª
循ç¯èåååï¼ä¸ä¸ªå¾ªç¯èæå 个æ°åï¼å°±ç¨å 个9ç»æçæ°ååæ¯ï¼è½çº¦åçè¦çº¦åãå¦
0.33â¦â¦(3循ç¯)=3/9=1/3
0.1313â¦â¦(13循ç¯)=13/99
0.031031â¦â¦(031循ç¯)=31/999
ä¸ãæ´æ°é¨åæ¯0ç混循ç¯å°æ°ååæ°ï¼æå®ååæä¸ä¸ªæéå°æ°å 纯循ç¯å°æ°ä¹1/10ã1/100â¦â¦çå½¢å¼ï¼ååå«ååæ°ï¼æåç®åºä¸¤ä¸ªåæ°çåãå¦
0.133â¦â¦(3循ç¯)
=0.1+0.33â¦â¦(3循ç¯)Ã1/10
=1/10+1/3Ã1/10
=1/10+1/30
=4/30=2/15
åã
æ éä¸å¾ªç¯å°æ°ä¸è½åæåæ°ã