is a positive integer, then, in terms of x, the number of integers that are both less than 4x and greater than 2x is( ).A. x B. 2x−1 C. 2x D. 2x+1 相关知识点: 试题来源: 解析 B The number, N, of integers between 2x and 4x is 1 less than the difference between 4x ...
If a is a positive integer, and if the units' digit of a2 is 9 and the units' digit of (a+1)2 is 4, what is the units' digit of (a+2)2?() A.1 B.3 C.5 D.7 E.9 相关知识点: 试题来源: 解析 A [解析] 根据a2的个位数是9可推知a的个位数可能为3或7,又根据(a+...
If n is a positive integer, is the value of b- a at least twice the value of 3n-2n ?() (1)a=2n+1 and b=3n+1 (2)n=3 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(2)联合起来充分. D.条件(1)充分,条...
is the product of the first n positive integers. For example, 4!=4×3×2×1=24. If u and v are positive integers and u!=v!×56, then v could equal( ). A. 6B. 8C. 56D. 57相关知识点: 试题来源: 解析 A There are two possible values for v:1) Since 56=55×56, one p...
If n is a positive integer,and if the units’digit of n2 is 6 and the units’digit of (n-1)2 is 9,the units’digit of (n+1)2 is ___. (英汉小词典 units’digit:个位数字) 相关知识点: 试题来源: 解析 试题分析:分别写出0到9平方的尾数对应情况,然后可得出n及n-1的尾数,进而可得出n...
2英语翻译if n is a positive integer,then n(n+1)(n+2) isA even only when n is oddB evne only when n is evenC odd whenever n is oddD divisible by 3 only when n is oddE divisible by 4 whenever n is even 3 英语翻译 if n is a positive integer,then n(n+1)(n+2) ...
If .x and y are integers and 3 is equal to an integer, what is the maximum possible value of x+y? ()(A)10(B)47(C)17(D)26(E)13 相关知识点: 试题来源: 解析 A解: 36^x*25^y=2^(2x)*3^(2x)*5^(2y) 。要使 (30!)/(2^(2x)*3^(2x*5^2)) 是整数,30!中质因数2的个...
If n is a positive integer, then which of the following must be true about (n) and (n+1)? () A. n is odd and (n+1) is even. B. n is even and (n+1) is odd. C. The product of the two terms is odd. D. The sum of the two terms is even. E. The product of the...
If n is a positive integer,and if the units’digit of the units’digit of 9,the units’digit of . (英汉小词典 units’个位数字) 相关知识点: 试题来源: 解析 5解:个位数为0到9的数的平方的个位数为:;;;由此可知n的个位数是4或6,又的个位数为3,可得n的个位数为4,的个位数为3,的个位数为...
if n is a positive integer,how many of the ten digits from 0 through 9 could be the units digit of n^3?相关知识点: 试题来源: 解析 如果N是正整数,当3^(8n+3) + 2 被5整除的余数是多少? 8n+3 when divided by 4 gives a remainder of 3. Since powers of 3 make cycles of 4 i.e...