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(...
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 n is a positive integer, which of the following is a possible value of |56 - 5n|? 选项: A、7 B、9 C、12 D、15 E、20 答案: B 提问列表 提问: 请问徐小梅老师,这题为什么选B呢?我当时觉得没一个选项符合条件。 5n是5的倍数,所以个位为0或5。如果个位为0,则56-5n的个位=6-0=6;...
If n is a positive integer, is(1)(2) Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient. BOTH statement TOGETHER are sufficient, but NEITHER statement ALONE is sufficient. EACH ...
If n is a positive integer and r is the remainder when (n-1)(n+1) is divided by 24, what is the value of r? (1) 2 is not a factor of n. (2) 3 is not a factor of n. 选项: 答案: C 提问列表 提问: 感觉2 , 3 不是N 的因子,5,7 等还是可以是N 的因子,若N=5, N^...
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的个数不能少于2x,同理, 质因数3的个数不能少于2x,质因数5的个数不能少于2y。 30!中质因数2有 (30)/2]+[(30)/4]+[(30)/8]+[(30)/(16)]=15+7+3+ 1=26(个),则 2x...
解析 2^n=(1+1)^n=(pmatrix) n 0 (pmatrix)1^n+(pmatrix) n 1 (pmatrix)(1)^(n-1)(1)+⋯ +(pmatrix) n n (pmatrix)1^n=(pmatrix) n 0 (pmatrix)+(pmatrix) n 1 (pmatrix)+⋯+(pmatrix) n n (pmatrix) 反馈 收藏 ...
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)
套数字取值，最快0小于等于r大于3，r=4+7n-3a,n=3b-1代入，r=3(7b-1-a)，r为3倍数，但0...
纠错 收藏 设置 If n is a positive integer, then n(n + l)(n + 2) is even only when n is even even only when n is odd odd whenever n is odd divisible by 3 only when n is odd divisible by 4 whenever n is even Help Quit Pause Next ...