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解æ:
å°æ°ç¹å左移å¨ä¸ä½å³å°è¯¥æ°ç¼©å°10åï¼ç»åæ°æ°æ¯åæ°å°39.15å¯ä»¥ç´æ¥æ±åºåæ°ãä¹å¯ä»¥éåæ¹ç¨è§£æ³è§£çæ¬é¢ã
解ç:
10ï¼1=9åâ¦â¦æ°æ°æ¯åæ°å°çåæ°
39.15÷9
=13.05÷3
=4.35â¦â¦æ°æ°
4.35Ã10=43.5â¦â¦åæ°
æ以ï¼åæ¥è¿ä¸ªæ°æ¯43.5ã
æ¹ç¨è§£æ³:
设è¿ä¸ªæ°æ¯nï¼æ ¹æ®é¢æååºæ¹ç¨å¦ä¸
nï¼0.1n=39.15
0.9n=39.15
n=39.15÷0.9
n=43.5
å°n=43.5代å
¥æ¹ç¨æ£éªå¾
左边=43.5ï¼0.1Ã43.5
=43.5Ã4.35
=39.15
=å³è¾¹
æ
n=43.5æ¯æ¹ç¨ç解
æ以ï¼ææ±çæ°æ¯43.5ã
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