of a b c is ( )(英语 positive integers:正整数;prime numbers:质数A. 14 B. 13 C. 12 D. 11 相关知识点: 试题来源: 解析 D. 解:译文:已知正整数a,b,c满足 a3bc+a=2005 ,其中a,b是质数,则a+b+c的值是 由已知得 a(a2bc+1)=2005=5∗401 因为a不可能等于401 所以a=5, 25bc=400...
There are five numbers 1, 3, 5, 7, 9 to form several composite numbers, and each number is used only once. The smallest sum of these composite numbers is . 相关知识点: 试题来源: 解析 214 Because the smaller the composite numbers' digits are, the smamller the sum is, so 1, 3,...
The LCM of two co-prime numbers is equal to the product of the two numbers.Example: What is the least common multiple of 3 and 5?3 and 5 are co-prime numbers.LCM(3, 5) =3×5=15If b is the multiple of a, then the LCM of a and b is b....
Prime Numbers:Prime numbers are positive integers greater than 1 whose factors are only 1 and itself. The first few prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23, and 29.Answer and Explanation: Become a member and unlock all St...
Prime factors of 225=3x3x5x5. How many prime factors exist for 225? 225 has 2 prime factors namely 3 and 5. What is the number for the prime numbers in 225? The prime factors of 225 are 3 and 5 What is the a product of prime factors for 100?
解析:若p和r是质数(prime number),则下面哪一个也一定是质数?解:本题的正确答案为(E)。此题可用排除法。质数就是除了1和它本身之外,没有其他因子的数,因此(A)选项是显然不正确的;由5+7=12可以断定(B)也是错误的,实际上两个质数的和为偶数;5×7+1=36可认定(C)是错误的;(D)也肯定不是质数,所以也...
1【题目】2,3,5,7,11,.. 2 are examples ofprime numbers; each number has only itself and 1 as factors. Suppose the number of unitsin each of the length and width of a rectangle are prime numbers and the perimeter is 36units. What is the largest number of square units the are a ...
What are Prime Numbers?doi:10.1142/9789814725828_0001P. Ribenboim
Finding the Prime Factorization with Exponents Start today. Try it now Math for Kids 23 chapters | 325 lessons Ch 1. Numbers for Elementary School Ch 2. Geometry for Elementary School Ch 3. Fractions for Elementary School Ch 4. Math Basics for Elementary... Ch 5. Statistics for Element...
The numbers 13 and 31 are prime numbers. Both these numbers have same digits 1 and 3. Find such pairs of prime numbers upto 100 View Solution The number of two digit prime numbers, with distinct digits, on being reversed they give again the prime number is : View Solution In a lotte...