相关知识点: 试题来源: 解析 E Prime numbers are whole numbers that have exactly two different factors. Of the answer choices:-5 is not a whole number.0 has many factors.1 has only one factor.51=(1)(52)=(3)(17)反馈 收藏
Which of the following can be written as the product of two different prime numbers?A. 8 B. 47 C. 49 D. 91 相关知识点: 试题来源: 解析 D 下面哪个数可以被写成两个不同的质数的乘积? 重点单词:Product,乘积;prime number,质数;composite number,合数. 91=7×13,选D....
The factors of 49 are1,7 , and49, Since 49 has 3 factors, it has a prime number of factors. 下列哪个数的整数因子的个数是质数( ). A.6 B.12 C.36 D.49 49的因数是1,7和49,因为49有3个因数,所以它的因数个数是质数. 故选D.结果...
Which of the following numbers is a prime number? A. 25 B. 27 C. 29 D. 30 相关知识点: 试题来源: 解析 C。25 可以被 5 整除,27 可以被 3 整除,30 可以被 2、3、5 整除。而 29 只能被 1 和 29 整除,所以 29 是质数。反馈 收藏 ...
A prime number is a positive integer having exactly two factors. If p is a prime, then the only factors it can have are 1 and p. Any number that does not fall into this category is said to as a composite number, meaning it may be factored into other posi
If p and r are prime numbers,which of the following must also be prime A. pr B. p+rC. pr+1 D. p2+r2E. None of the above 相关知识点: 试题来源: 解析E 若p和r是质数(prime number),则下面哪一个也一定是质数 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)...
Which one of the following numbers is a prime number?( ) A.111 B.113 C.117 D.119相关知识点: 试题来源: 解析 B 111=3×37,117=3×39,119=7×17;therefore111, 117 and 119 are all composite numbers; only 113 is a prime number.反馈 收藏 ...
On prime numbers, for which (almost) all fermat numbers are quadratic non-residuesIt is well known that 3, 5, 7 are such primes. But in higher regions they appear only very rare. There exist many residue classes without such primes. Also other conditions for their existence are given. ...
Prime Number Definition & Examples from Chapter 24 / Lesson 16 216K What is a prime number? Learn the definition of a prime number, how prime numbers differ from composite numbers and examples of which numbers are prime numbers. R...
If x and y are different prime numbers, each greater than 2, which of the following must be true ?()Ⅰx+y≠91 Ⅱx-y is an even integer. Ⅲ is not an integer. A.条件(1)充分,但条件(2)不充分. B.条件(2)充分,但条件(1)不充分. C.条件(1)和(2)单独都不充分,但条件(1)和条件(...