How many 3-digit numbers are there so that the sum of its digits is 5?有多少个三位数的各个数字之和是5? 答案 15个.各个数字之和为5,百位是1的三位数有104、113、122、131、140;百位是3的三位数有203、212、221、230;百位是3的三位数有302、311、320;百位是4的三位数有401、410;百位是5的三位...
How many three-digit numbers are there that have the sum of their digits equal to 7?. 相关知识点: 试题来源: 解析 28.. First of all, we can list out the ways to rewrite 7 as the sum of three numbers: 7=0+0+7=0+1+6=0+2+5=0+3+4 =1+1+5=1+2+4=1+3+3=2+2+3 ...
所以有8种选择, 一共可以组成9×9×8=648个没有重复数字的三位数.结果一 题目 没有重复数字的三位数有多少个?How many three-digit numbers are there with no repeating digits? 答案 648.相关推荐 1没有重复数字的三位数有多少个?How many three-digit numbers are there with no repeating digits?反馈...
How many three-digit numbers are there that have the sum of their digits equal to 7? 答案 28.First of all, we can list out the ways to rewrite 7 as the sum of three numbers: 7=0+0+7=0+1+6=0+2+5=0+3+4 =1+1+5=1+2+4=1+3+3=2+2+3Different three-digit numbers can ...
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 反馈 收藏 ...
aDongying aijian science and Trade Co Ltd Dongying aijian科学和贸易Co有限公司[translate] aTurn step 转动步[translate] aHow many 3-digit numbers are there in which the number of even digits is even? 多少个3数字数字有没有在哪些均匀数字的数量是均匀的?[translate]...
How many three-digit numbers are there in which any two adjacent digits differ by 3? A. 12 B. 14 C. 16 D. 18 E. 20 相关知识点: 试题来源: 解析 E The first digit can be anything from 1 to 9. Where possible, we can reduce this by three or increase it by three to get the ...
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 3 digit numbers are there such that the sum of the digits is 17? Writing Simple Equations. Writing simple equations with certain constraints is an easy task to do if we can figure out which digit has which constraints. Certain constraints to keep in mind while solvi...
结果一 题目 In a number sequence below: 1, 2, 3, ⋯ , 97, 98, 99How many numbers are there? How many digits are there? 答案 99 numbers;189 digits.相关推荐 1In a number sequence below: 1, 2, 3, ⋯ , 97, 98, 99How many numbers are there? How many digits are there?