67.How many3-digit numbers satisfy(满足)the property that the middle digit is the average of thefirst and the last digits?((A)42(B)43(C)44(D)4567.How many 3-digit numbers satisfy(满足)the property that the middle digit is the average of the first and the last digits? () (A)42...
Review place value, drawing columns, and lining up to understand how to get the correct answers when it is time to add. Place Value When adding larger numbers that have three or more digits, the key is to remember the concept of place value. This is the value of a digit depending on...
When adding two numbers, the result may be large enough to include more digits than the original numbers each did. Learn the steps in adding numbers together to result in a larger sum, and how to align the addends to master addition through practice of examples. ...
tens place can be filled by any of the 6 digits in 6 different ways and also the hundreds place can be filled by any of the 6 digits in 6 different ways, as the digits can be repeated.Therefore, by multiplication principle, the required number of three digit even numbers is 3*6*6=...
How many three-digit numbers can be made using the digits 0, 1, 2, 3, 4, and 5? How many four-digit numbers can be made without repeating digits?How many five-digit numbers can be made using the digits 0, 1, 2, 3, 4, 5, and 6 without repeating digits?
百度试题 结果1 题目How many 3 digits numbers have exactly one digit 5 in them?ji 相关知识点: 试题来源: 解析 既然是3位数字,那么考虑区间就是100-999情况1,有一个5:9*9=81个情况2,有两个5:9+9=18个情况3,有三个5:1个总共:100个 反馈 收藏 ...
How ma ny four-digi tnumbers can be mad ewithout re【题目】Answe rthe following questions:How many three-digit numbers can be made u sing the digits 0 ,1 ,2 ,3 ,4 ,and 5? How ma 3【题目】Answer the following questions:How many three-digit numbers can be made wsing the digits...
答案 20. 相关推荐 1Choose 3 digits from 0, 2, 6, 8, 9 to form 3-digit numbers. How many number(s) that can be divisible by 5 is/ are there? (The repetition of digits is allowed)从0﹑2﹑6﹑8﹑9中选数位组成三位数.请问当中有多少个是5的倍数?(数位可以重复) 反馈 收藏 ...
在所有的三位数中，其中有且只有一位是5的有多少个？解：假设5在百位，即：5 _ _ ，剩下的两个位置可以填入0到9（除了5）的任何数，所以他们的组合有9×9＝81个；若5在十位，即：_ 5 _ ，则百位除5不能填以外，0也不能填，因为要保持是三位数，所以可能的组合有8×9＝72个；若5在...
相关知识点: 试题来源: 解析 C 有多少个三位正整数各位数的和是25? 因为8+8+8=24,因此,其中一个数字必须是9,另外两个数字的和是25−9=16.数字和的结果是25的是799,889可按如下方式排列799,979,997,889,898,988,匹配的数量为(C)6.反馈 收藏 ...