number表示一個(gè)數(shù),digit表示一個(gè)數(shù)字
如：18是一個(gè)number,有2個(gè)digits
而題目說Nancy有本書,每頁的頁碼的數(shù)中的數(shù)字個(gè)數(shù)加起來是813,問這本書有多少頁?
首先,1到9有9個(gè)數(shù)字.
接下來就是兩位數(shù),10-99有90*2=180個(gè)數(shù)字.
而書里有813個(gè)數(shù)字,所以還余下813-9-180=624個(gè)數(shù)字.
接下來編碼的頁碼都是三位數(shù),624可以編624/3=208個(gè)頁碼.
所以這本書有100+208-1=307頁.
南外英語數(shù)學(xué)題Do you know the different between number and digit?
南外英語數(shù)學(xué)題Do you know the different between number and digit?
do you know the different between number and digit?Nancy has a book.Now she wants to number the pages with 813 digits.How many pages does the book have?
大家答的都很好,babybluein答得更詳細(xì)些,所以最佳就給他啦,
do you know the different between number and digit?Nancy has a book.Now she wants to number the pages with 813 digits.How many pages does the book have?
大家答的都很好,babybluein答得更詳細(xì)些,所以最佳就給他啦,
其他人氣：706 ℃時(shí)間：2019-09-16 19:01:53
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