百度试题 结果1 题目A book has 10 pages. How many digits are there altogether in the page numbers of the book?digits. 相关知识点: 试题来源: 解析 11. Numbers 1 to 9 have 1 digit each, total 9 digits. Number 10 has 2 digits. 9+2=11. ...
结果1 题目A book has 10 pages. How many digits are there altogether in the page numbers of the book? digits 相关知识点: 试题来源: 解析 11 Numbers 1 to 9 have 1 digit each, total 9 digits. Number 10 has 2 digits. 9+2=11
解析 240. Page 1 to Page 9 : 9 digits, Page 10 to Page 99 : 180 digits, Page 100 to Page 116 : 116−100=16, 16+1=17 page numbers, 17×3=51 digits, 9+180+51=240, 240 digits are used for printing the page numbers of the book.. ...
1How many 2−digit numbers are there such that the sum of the digits is divisible by 3 and no repeated digits are used?有多少个数位之和是3的倍数且没有重复数位的两位数? 2How many 2-digit number(s) is/ are there such that the sum of the digits is divisible by 4 and no repeated...
百度试题 结果1 题目17. How many three-digit numbers are there such thatthe product of their digits is a prime number?(Remember 1 is not a prime number.) B(A)15(B)12C)17D)20(E)21 相关知识点: 试题来源: 解析 答案见上
( ).A.13B.16C.17D.18E.19 2【题目】How many two-digit numbers have digits whose sumis a perfect square?().A.13B.16C.17D.18E.19 3【题目】How many two-digit numbers have digits whose sum is a perfect square?().A.13B.16C.17D.18E.19 ...
百度试题 结果1 题目How many 2−digit numbers are there such that the sum of the digits is divisible by 3 and no repeated digits are used?有多少个数位之和是3的倍数且没有重复数位的两位数?相关知识点: 试题来源: 解析 27.
(Maths Olympiad 《Problems from Page Numbers》 Pr4&5 Question #18)How many digits are there before the '3' in 3 8 3 88 3 888 3 8888 3 88888 ? 答案 5049.相关推荐 1(Maths Olympiad 《Problems from Page Numbers》 Pr4&5 Question #18)How many digits are there before the '3' in 3...
解析 45 We can put "0" on the tens place and the ones place. Thus, after adding 2, the problem can be changed into: to divide 11 into three groups, and each group must get 1 at least. Thus, there are _(10)C_2=45 ways in total....
How many four-digit numbers are there formed from the digits 1, 2, 3, 4, 5 (with possible repetition) that are evenly divisible by 4? Divison Rule A two or more digit number is divisible by 4 if the last two digits of the number...