A book has 120 pages numbered l,2,3,and so .A book has 120 pages numbered l,2,3,and so on.How many times does the digit 1 (数字1)appear in the page numbers?A.52 B.53 C.50 D.49

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/14 10:55:36
A book has 120 pages numbered l,2,3,and so .A book has 120 pages numbered l,2,3,and so on.How many times does the digit 1 (数字1)appear in the page numbers?A.52 B.53 C.50 D.49

A book has 120 pages numbered l,2,3,and so .A book has 120 pages numbered l,2,3,and so on.How many times does the digit 1 (数字1)appear in the page numbers?A.52 B.53 C.50 D.49
A book has 120 pages numbered l,2,3,and so .
A book has 120 pages numbered l,2,3,and so on.How many times does the digit 1 (数字1)appear in the page numbers?
A.52 B.53 C.50 D.49

A book has 120 pages numbered l,2,3,and so .A book has 120 pages numbered l,2,3,and so on.How many times does the digit 1 (数字1)appear in the page numbers?A.52 B.53 C.50 D.49
选【A】
首先明确是问的是1出现的次数,则:
【1】一位数出现【1】次,即第一页
【2】两位数:[1]十位是1,(10、11、12、13、14、15、16、17、18、19)出现11个1
[2]个位是1,(1、11、21、31、41、51、61、71、81、91)出现10次1
11算了两次,减去两个1,所以两位数的情况共有:11+10-2=【19】次
【3】三位数:百位肯定为1,十位只能是0和1,
[1]十位是0,(100、101、102、103、104、105、106、107、108、109)出现【11】个1
[2]十位是1,有1×10×1=10次(110、111、112、113、114、115、116、117、118、119)出现【21】个1
最后加起来:1+19+11+21=52

1 10 11 12 13 14 15 16 17 18 19 21 31 41 51 61 71 81 91 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120
总之从1-120里面有多少个1,答案就是了
我算过的是A 52 个,以确定答案,你自己算过一次吧。虽然你...

全部展开

1 10 11 12 13 14 15 16 17 18 19 21 31 41 51 61 71 81 91 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120
总之从1-120里面有多少个1,答案就是了
我算过的是A 52 个,以确定答案,你自己算过一次吧。

收起

A book has 120 pages numbered l,2,3,and so .A book has 120 pages numbered l,2,3,and so on.How many times does the digit 1 (数字1)appear in the page numbers?A.52 B.53 C.50 D.49 一道数学题:A boy has fished reading 160 pages of a story book and he finds that there 20% of the book left.How many pages are there in zhe book? 居然数学题用英语出~太多元化了!A boy has finished feading 160 pages of a story book and he finds that there is 20% of the book left.How many pages are there in the book? a boy has finished reading 160 pages of a story book and he finds that there is 20% of the book lefhow many pages are there in the book The book has 250 pages,plus 20 pages of appendices.中plus的词性 this is an interesting book _____ three hundred pages A.has B.have C.with D.which have how __is this book?— It has fifty pages.A、long B、length C、much D、deep 理由呢? how __is this book?— It has fifty pages.A、long B、length C、much D、deep 正确答案是哪个? they look like the pages of a book.谢 Every day without you is like a book without pages She _______ 100 pages of the book today选择一项:a.has already read b.already read c.was already read d.already reads 英语翻译1.40% of the students in a school are boys.lf there are 240 boys,how many student are therein the school?2.a boy has finished reading 160pages of a story book and he finds that is 20% of the book left.how many pages are there in the book? 英语翻译1)40%of the students in a school are boys.lf there are 240boys,how many students are there in the school?2)A boy has finished reading 160 pages of a story book and he finds that there is 20% of the book left.How many pages are there in th this book is 115 pages,that book is 120 pages this book is ________ than that book.that book is ________ than this bookhe plays computer games for a some times b some time c sometimes i will wait _______ you finish your homeworka unit b while c if 南外英语数学题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,baby 英语翻译Below is the information of the Book and the type of Paper I need the prices for.I have also attached a link which has a link which has the picture of the book.The specifics of the composition book are:a.100 sheets/200 pages composition b “the document has no pages The sum of two facing pages of a book is 342.Find the two page numbers.