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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
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一個數學題!!!!(20點)
Feb 9th 2014, 05:37

一三位數,十位數字為a,百位數字為十位數字的2倍多3,個位數字為十位數字少1→百位數是2a+3,十位數是a,個位數是a-1
若a是1,則此3位數是510
若a是2,則此3位數是721
若a是3,則此3位數是932
若a是4,則此3位數不存在,因為百位數會變成2位數
a是4時不合 ,則如果用比4還大的數帶進去一定不合
故此三位數共有3個

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