How many three-digit numbers have a sum of digits not divisible by 7? 答案 774.设三位数abc的百位,十位,个位上的数字分别为a,b,c,则1⩽a⩽9,0⩽b⩽9,0⩽c⩽9,且a,b,c均为整数,最小的三位数是100,最大的三位数是999,则三位数有999−100+1=900个,若这个三位数的数字之和能被...
Determine all three-digit numbers N having the property that N is divisible by 11,and Nand11 is equal to the sum of the squares of the digits of N. (BGR) 1.求出所有的三位数,使得这个三位数除以 11 所得的商是它各位数字的平方和. (保加利亚) 答案 1.设N=100a+10b+c,a≥1为所要求的...
This yields 4 more numbers. When x=9, 18+y<20 so y<2. This yields 2 more numbers. Summing, we get 40+8+6+4+2=(B)60.结果一 题目 【题目】How many three-digit numbers are not divisible by 5, have digits that sum to less than 20, and have thefirst digit equal to the third...
How many four-digit numbers can there be if repetition of numbers are allowed and if repetition of numbers are not allowed? Using only the digits 5, 6, 7, 8, how many different 3 digit numbers can be formed if no digit is repeated in a number?...
How many four-digit numbers containing no zeros have the property that whenever any one of its four digits is removed ,the resulting three-digit number is divisible by 扫码下载作业帮搜索答疑一搜即得 答案解析 查看更多优质解析 解答一 举报 One thing to remember is that a number is divisible by...
Prime Numbers: Prime numbers are one of the important concepts that is in mathematics. These numbers are basically not the factor by itself but are one of the factor of the composite numbers. The largest prime number is still not discovered. ...
Find three positive numbers x, y, and z whose sum is 320 such that {eq}x^ay^bz^c {/eq} is a maximum. (Give exact answers.) x = y = z = Higher-Order Partial Derivative This problem is based on the application of higher-order pa...
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When a=3, we have 4b+7c=78. Now, c can take the values 0,2,4,6 or 8. If c=2 then b=16, which is not a single digit. If c=0,4 or 8, non-integer values for b are obtained. If c=6 then b=9.The only three-digit numbers which satisfy the required condition are ...