n is a positive integer. If a and V- a are meaningful for all real numbers a, then ( ).(A) n is an odd number.(B) n is an even number.(C)n can be either odd or even.(D) There is no such n that satisfies the condition. 相关知识点: 试题来源: 解析 反馈 收藏 ...
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,条件(...
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...
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, 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...
百度试题 结果1 题目Given that n is a positive integer, then 10" is ( ).(A) the product of ten ns(B) an n-digit integer(C) a(n+1)-digit integer(D) a(n-2)-digit integer 相关知识点: 试题来源: 解析 C 反馈 收藏
Therefore, the equation holds when n=k+1.If the equation holds for n=k then it has been shown to be true for n=k+1.As the equation holds for n=1, it is now also true for all n∈ ^+ by mathematical induction.反馈 收藏
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...
【题目】Given that n is a positive integer, prove by indu_(dt)=r^2e^(inθ) 相关知识点: 试题来源: 解析 【解析】n=1; LHS=(re^(i-))^1=re^(iθ)RHS=rlei=reiAs LHS=RHS, the equation holds for n=1.Assume the equation holds for n=k, k∈Z+.i .(reio)k = rkikoWith n=k...
If n is a positive integer , and if the units ’ digit of n2is 6 and the units ’ digit of (n−1)2is 9 , the units ’ digit of (n+1)2is ___.( 英汉小词典 units ’ digit: 个位数字 ) 相关知识点: 试题来源: 解析 个位数为 0 到 9 的数的平方的个位数为: 0−−...