单选题If m and n are positive integers and 3m+n-1=2m+2n, which of the following must be true?I. m and n are consecutive integers.II. m is even.III. n is odd.A NoneB I onlyC II onlyD III onlyE I, II, and III

题目

单选题

If m and n are positive integers and 3m+n-1=2m+2n, which of the following must be true?I. m and n are consecutive integers.II. m is even.III. n is odd.

None

I only

II only

III only

I, II, and III

相似考题

1.Which one is a positive way of managing stress()A.overusing drugsB.smokingC.drinking too muchD.listensing to the music

2.下列程序的功能是：将大于整数m且紧靠m的k个被3除余1的素数存入数组xx。请编写函数num(int m，imt k，int xx[])实现程序的要求，最后调用函数readwriteDat()把结果输出到文件out.dat中。例如：若输入17，5，则应输出：19，31，37，43，61。部分源程序已给出。请勿改动主函数main()和输出数据函数readwriteDat()的内容。include ＜conio.h＞include ＜stdio.h＞void readwriteDat();void num(int m, int k, int xx[]){}main ( ){int m,n,xx[1000];clrscr();printf("\nPlease enter two integers:");scanf(" %d%d" ,&m,&n);num(m,n,xx);for(m=0;m＜n;m++)printf(" %d" ,xx[m]);printf("\n" );readwriteDat();}viod readwriteDat(){int m,n, xx[1000], i；FILE *rf,*wf;rf=fopen("in.dat" ," r" );wf=fopen(" out.dat" ," w" );for(i=0;i＜10;i++){fscanf(rf," %d%d" ,&m,&n);num(m,n,xx);for(m=0;m＜n;m++)fprintf(wf," %d" ,xx[m]fprintf(wf,"\n" );}fclose(rf);fclose(wf);}

3.下列程序的功能是：将大于整数m且紧靠m的k个素数存入数组xx。请编写函数num(int m，int k，int xx[])实现程序的要求，最后调用函数read write DAT()把结果输出到out31.dat文件中。例如，若输入17，5，则应输出19，23，29，31，37。注意：部分源程序已给出。请勿改动主函数main()和输入输出函数read write DAT()的内容。试题程序：include < conio.h>includeVoid readwriteDAT()；Void num(int m,int k,,int XX[]){}main(){int m,n,xx[1000]；Clrscr();printf(“\nPlease enter tWO integers:”)‘scanf(“%d，%d”,&m,&n);num(m, n, XX)；for(m=0;m＜n；m++)printf(“%d”, XX[m])；printf(”\n”);readwriteDAT();)VOid read write DAT(){int m，n，xx[1000],i；FILE *rf.,*Wf；rf=fopen(“in31．Dat”,r”)；Wffopen(“ou1t31．Dat”/”w”)；。 for(i=0;i＜10;i++){fscanf(rf,%d,” %d”,&m,&n);num(m，n，XX);for(m=0;m fprintf(wf,%d”,xx[m]);fprintf (wf, “\n”);}fclose(rf);fclose (wf);}

4.请编写一个函数void fun(int m， int k， int xx[])，该函数的功能是将大于整数m且紧靠m的k个非素数存入所指的数组中。例如，若输入15，5，则应输出16，18，20，21，22。注意：部分源程序给出如下。请勿改动主函数main和其他函数中的任何内容，仅在函数fun的花括号中填入所编写的若干语句。试题程序：include＜conio.h＞include＜stdio.h＞void fun(int m，int k，int xx[]){}main(){int m，n，zz[1000]；clrscr()；printf("\nPlease enter two integers：")；scanf("%d%d"，&m，&n)；fun(m，n，zz)；for(m=0；m＜n；m++)printf("%d"，zz[m])；printf("\n")；}

更多“If m and n are positive integers and 3m+n-1=2m+2n, which of”相关问题

第1题：

下列程序的功能是：将大于整数m且紧靠m的k个素数存入数组xx中。请编写函数num(int m, int k, int xx[])实现程序的要求，最后调用函数readwriteDAT() 把结果输出到文件out.dat中。例如：若输入“17, 5”，则应输出“19, 23, 29, 31, 37”。注意：部分源程序已给出。请勿改动主函数main()和函数readwriteDAT()的内容。#include <conio.h>#include <stdio.h>void readwriteDat();void num(int m, int k, int xx[]){ }main(){ int m, n, xx[1000]; printf("\nPlease enter two integers:"); scanf("%d%d", &m, &n); num(m, n, xx); for (m=0; m<n; m++) printf("%d ", xx[m]); printf("\n"); readwriteDat();}void readwriteDat(){ int m, n, xx[1000], i; FILE *rf, *wf; rf = fopen("in.dat", "r"); wf = fopen("out.dat", "w"); for (i=0; i<10; i++) { fscanf(rf, "%d %d", &m, &n); num(m, n, xx); for (m=0; m<n; m++) fprintf(wf, "%d ", xx[m]); fprintf(wf, "\n"); } fclose(rf); fclose(wf);}

正确答案：参考试题解析
【解析及答案】
该程序属于按条件查找类型的题目，考核的知识点主要为：判断一个数字是否为素数及统计素数的个数。
本题的解题思路为：从整数m+1开始逐个判断一个整数是否为素数。若是素数，则将其存入数组xx中，直至找到连续的k个素数为止。判断一个整数是否为素数，可以通过将该整数分别除以2到该整数的1/2之间的所有整数来进行。例如，要判断17是否为素数，则将其分别除以2、3、4、5、6、7、8，若都不能整除，该整数就一定是素数。要寻找连续的k个素数，可以设置一个记录个数的变量，每找到1个素数时，该记录的值就增加1。
程序的流程为：首先从键盘输入2个十进制整数，以第1个整数作为基础开始寻找素数，将第2个整数作为需要寻找素数的个数，然后通过函数readwriteDat() 从文件in.dat中读入10组数据，通过函数num() 的计算，把结果写入文件out.dat中。在函数num() 中使用一个while循环查找k个素数，每次查找成功后，n的值将增加1。因为不能确定循环执行的具体次数，所以设定while循环的条件恒为真（条件为“1”），并加入跳出循环的控制语句，即当nk时循环结束。进入while循环体后，首先使用for循环确定当前数字是否为素数，即判断当前整数data是否能被2到它的1/2之间的任意整数整除。如果能被整除，则说明该整数不是素数，程序通过break语句跳出for循环（此时i≤half）；否则，当循环执行到i>half时，程序正常退出for循环体，说明当前整数data是素数。这里的i值既是for循环的计数器，又是当前数字是否为素数的标志。if语句将根据此时i值的大小判断整数data是否为素数，如果是素数，则将整数data存入数组xx中，同时记录素数个数的变量n的值将增加1。接着判断变量n的值是否达到了要求的个数，如果达到，则跳出while循环，函数num() 结束；否则，整数data加1后重新进入while循环体，直到找到满足题意的个数的素数，函数num() 结束。
void num(int m,int k,int xx[])
{int data=m+1;
int half,n=0,I;
while(1)
{
half=data/2;
for(I=2;I<=half;I++)
if(data%I==0)
break;
if(I>half)
{
xx[n]=data;
n++;
}
if(n>=k)
break;
data++;
}
}
第2题：

A good advertisement often uses words__________people attach positive meanings.

A.that
B.which
C.with which
D.to which

答案：D
解析：
“一people attach positive meanings”可理解为“people attach positive meanings to which”。attach…to意为“把……附在．……上”。故本题正确答案选D。
第3题：

单选题
x, y, and z are positive integers. Which of the following lists all the possible ways for x + y + z to be an odd number?I. One of the numbers is odd.II. Two of the numbers are odd.III. Three of the numbers are odd.
A
I
B
I and II
C
I and III
D
II and III

正确答案： C
解析：
I. One of the numbers is odd. Let x be odd. Let y and z be even. y + z is even. An even plus an odd is odd, so x + y + z is odd.
第4题：

单选题
What is the average (arithmetic mean) of 8 consecutive odd integers if the smallest of those integers is n?
A
n+5
B
n+6
C
n+7
D
n+8
E
n+9

正确答案： E
解析：
最小的整数为n。它们是连续的奇数。这组整数为:n,n+ 2, n+4, n+6, n+8, n+10, n+12, n+14。计算这些整数的平均数即为将它们想加除于8。得出（8n+56）/8=n+7
第5题：

单选题
If n/6, n/8 and n/9 are all integers, then n must be divisible by ______.
A
54
B
64
C
65
D
68
E
72

正确答案： E
解析：
因为n/6, n/8和n/9都是整数，那么n一定是6,8,9的倍数。这三个数的最小公倍数为72。n 可以是比72大的整数，但是n一定是72的倍数，如144,216。
第6题：

多选题
If x and y are both positive even integers, which of the following expressions must be even? (Select all such expressions.)
A
x^y
B
(x+1)^y
C
x^(y+1)

正确答案： B,A
解析：
由于题目中x和y是变量，可以根据题干给出的条件给x, y设定符合条件的数值，代入各选项，看结果是否符合题干要求，即可得出答案。
第7题：

单选题
Which of the following constraint types can be used to ensure the value of an INTEGER column references only positive values?（）
A
Unique
B
Check
C
Referential
D
Informational

正确答案： B
解析：暂无解析
第8题：

单选题
If the sum of 4 consecutive positive integers is w, in terms of w, which of the following represents the sum of the next 4 consecutive positive integers?
A
w²+16
B
w+16
C
4w+16
D
4w+4
E
w+4

正确答案： D
解析：
Let x, x+1, x+2, x+3, represent the 4 consecutive integers. Then, x+x+1+x+2+x+3=w or 4x+6=w. The next 4 consecutive positive integers will be：x+4, x+5, x+6, x+7. Their sum will be：4x+22=4x+6+16=w+16.
第9题：

单选题
Which of the listed pumps is NOT a positive displacement pump?（）
A
Centrifugal
B
Reciprocating
C
Gear
D
Rotary

正确答案： A
解析：暂无解析
第10题：

单选题
al, a2, a3, a4, as, …., anIn the sequence of positive integers above, al = a2 = 1, a3 = 2, a4 = 3, and as = 5. If each term after the second is obtained by adding the two terms that come before it and if an = 55, what is the value of n?
A
12
B
10
C
9
D
8
E
5

正确答案： A
解析：
Following the given rule for obtaining terms, write the terms of the sequence up to and including 55: 1, 1, 2, 3, 5, 8, 13, 21, 34, 55 Since 10 numbers are listed, n = 10.
第11题：

单选题
How many positive integers less than 70 are equal to the product of a positive multiple of 5 and an even number?
A
4
B
6
C
9
D
10
E
11

正确答案： D
解析：
All even multiples of 5 must be multiples of 10. So the multiples of 10 between 0 and 70 are 10, 20, 30, 40, 50 and 60. That’s 6 altogether.
第12题：

问答题
Any decimal that has a finite number of nonzero digits is a terminating decimal. For example, 16, 12.43, and 0.26 are all terminating decimals. If a and b are positive integers and the ratio a／b is expressed as a decimal, is a／b a terminating decimal?　　(1) b=5　　(2) 70

正确答案： A
解析：
条件2无法得出结论；由条件1可知，a/b是有尽小数，故本题选A项。
第13题：

Which of the following constraint types can be used to ensure the value of an INTEGER column references only positive values?()

A.Unique
B.Check
C.Referential
D.Informational

参考答案：B
第14题：

单选题
If a and b are integers and the sum of ab and b is even, which of the following could be true?Ⅰ. a and b are both odd.Ⅱ. a is even and b is odd.Ⅲ. a is odd and b is even.
A
Ⅰ only
B
Ⅱonly
C
Ⅲ only
D
Ⅰ and Ⅱ
E
Ⅰand Ⅲ

正确答案： C
解析：
Plug-in. StatementⅠ：if a and b are both odd, says a=1 and b=3, then ab+b=6. Since the sum is even, statementⅠ is true. StatementⅡ：1et a=2 and b=3, then ab+b=9. Since the sum is odd, this statement is false. Statement Ⅲ：let a=3 and b=2, then ab+b=8, which is even. So both statement Ⅰand statementⅢ are true.
第15题：

单选题
Which of the following is true?
A
All nicknames have a positive meaning.
B
All negatives have a negative meaning.
C
Nicknames are endearing.
D
All nicknames can be either positive or negative.

正确答案： A
解析：
倒数第二段提及Not every nickname, however, is a complement and some can be downright rude and insulting“并非所有的昵称都表示赞赏，有些昵称甚至十分粗鲁或带有污辱性”，表明应该以辩证的态度看待昵称，选项D符合。
第16题：

单选题
How many positive 3-digit integers contain only odd digits?
A
15
B
75
C
125
D
225
E
500

正确答案： C
解析：
根据题干可知三位数可以从1,3,5,7,9中选出。因为3位数字可以独立的选择，所以三位数字可为5×5×5=125，故选C。
第17题：

单选题
Set X = even integers and Set Y = odd integers. Therefore X ∩ Y = ______.
A
prime numbers
B
integers
C
empty set
D
composite numbers
E
whole numbers

正确答案： A
解析：
When two sets have nothing in common, we refer to their intersection as the empty set. There are two appropriate ways to denote the empty set: X∩Y={ } or X∩Y=φ.
第18题：

多选题
If 4 more than twice n is a negative number and 6 more than n is a positive number, which of the following numbers could be the value of n? (Select all such numbers.)
A
-5
B
4
C
-3

正确答案： B,A
解析：
根据题目中的已知条件可得，4+2n<0，6+n>0，把各个选项分别代入两个不等式中检验，同时符合两个不等式可得到n可以等于-5，-4，-3，故正确答案为AC。
第19题：

单选题
If m and n are positive integers and 3m+n-1=2m+2n, which of the following must be true?I. m and n are consecutive integers.II. m is even.III. n is odd.
A
None
B
I only
C
II only
D
III only
E
I, II, and III

正确答案： D
解析：
Since m=n+1, where m and n are given as positive integers, Roman numeral choice I is true. Since, m=n+1, m can be either odd or even, hence choice II is false. Roman numeral choice III is also false since n can be either even or odd.
第20题：

单选题
For all positive integers a and b, let (a|b)=(a-b)/(a+b) If m is a positive integer, what is (m|2m) ?
A
-1/2
B
-1/3
C
1/3
D
1/2
E
2

正确答案： D
解析：
(m|2m)=(m-2m)/(m+2m)=-1/3。
第21题：

单选题
Let Ω p be defined as p2/3-p for all positive integers, p. If Ωn = s, and s is a positive integer, which of the following is a possible value for s?
A
1
B
3
C
5
D
6
E
8

正确答案： D
解析：
根据题干Ωn =n²/3-n=s. n为正整数，且s为正整数；根据函数可知只有当n是3的倍数时，s才能为整数，否则如果n²/3不是整数，s也不是整数。现在可以从符合条件的n的最小值3代入到函数中。当n=3时，n²/3-n =3²/3-3 = 3-3 = 0 = s；当n=6时，n²/3-n = 6²/3-6 = 12-6 = 6 = s。所以故选D。
第22题：

单选题
How many different positive integers are factors of 342?
A
9
B
11
C
12
D
20
E
22

正确答案： C
解析：
342=1×342=2×171=3×114=6×57=9×38=18×19，故本题选C项。
第23题：

单选题
Which of the following integers is divisible by 4 and 6, but is not divisible by 8?
A
12
B
24
C
48
D
64
E
72

正确答案： B
解析：
第一个数字能被4和12整除，但不能被8整除。因此正确选项为A。24,48,64,72，都能被4,6,8,整除。
第24题：

单选题
If a and b are positive integers such that (a-4)(b-5) = 0, what is the least possible value of a + b?
A
5
B
6
C
8
D
10
E
11

正确答案： E
解析：
如果(a-4)(b-5) = 0，所以(a-4) = 0或(b-5) =0，或两者都等于0，a = 4 或b = 5.，如果要使a + b的值最小，我们应该假设a=4，那么b可以为任何值，又因为b的值为正整数，所以b的最小值为1，所以a + b最小的可能值为4+1=5。

单选题If m and n are positive integers and 3m+n-1=2m+2n, which of the following must be true?I. m and n are consecutive integers.II. m is even.III. n is odd.A NoneB I onlyC II onlyD III onlyE I, II, and III

题目

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