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单选题
The symbol ☆ represents one of the fundamental arithmetic operators：+, -, ×, or ÷. If (x☆y)÷(y☆x)=1 for all positive values of x and y, then ☆ can represent ______.
A
+ only
B
÷only
C
+ or × only
D
- or × only
E
+, -, ×, ÷
参考答案
参考解析
解析：
(x × y)÷(y × x) = (xy)/(yx) = 1 and (x+y)÷(y+x)=(x+y)/(y+x)=1.
(x × y)÷(y × x) = (xy)/(yx) = 1 and (x+y)÷(y+x)=(x+y)/(y+x)=1.
更多 “单选题The symbol ☆ represents one of the fundamental arithmetic operators：+, -, ×, or ÷. If (x☆y)÷(y☆x)=1 for all positive values of x and y, then ☆ can represent ______.A + onlyB ÷onlyC + or × onlyD - or × onlyE +, -, ×, ÷” 相关考题
考题
In the following statements about functional dependency, which one is incorrect?A．Ifthen X→X'.B．If X→Y andthen X→Y'.C．If X→Y andthen X'→Y.D．If X→Y and Y→Z, then X→Z.
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In the following statements about functional dependency, which one is incorrect?A．If X→Y and Y→Z, then X→Z.B．If X→Y and, then X→Y'.C．If X→Y and, then X'→Y.D．If, then X→X'.
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考题
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考题
与y=(x>0? 1:x0)y=1 else if(x
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考题
与y=(x>0?1:x0)y=1; else if(x
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考题
已知y1(x)和y2(x)是方程y''+p(x)y'+Q(x)y=0的两个线性无关的特解， Y1(x)和Y2 (x)分别是方程y''+p(x)y'+Q(x)y=R1(x)和y''+p(x)y'+Q(x)y=R2(x)的特解。那么方程y''+p(x)y'+Q(x)y=R1(x)y+R2(x)的通解应是：
A. c1y1+c2y2B. c1Y1(x)+c2Y2(x)
C. c1y1+c2y2+Y1(x) D. c1y1+c2y2+Y1(x)+Y2(x)
考题
1. public class X implements Runnable（ 2. private int x； 3. private int y； 4. 5. public static void main（String[]args） 6. X that = new X（）； 7. （new Thread（that））.start（）； 8. （new Thread（that））.start（）； 9. ） 10. 11. public void run（） （ 12. for （；；） （ 13. x++； 14. y++； 15. System.out.printIn（“x=” + x + “， y = ” + y）； 16. ） 17. ） What is the result？（）A、 Errors at lines 7 and 8 cause compilation to fail.B、 The program prints pairs of values for x and y that might not always be the same on the same line （for example， “x=2， y=1”）.C、 The program prints pairs of values for x and y that are always the same on the same line （for example， “x=1， y=1”. In addition， each value appears twice （for example， “x=1， y=1” followed by “x=1， y=1”）.D、 The program prints pairs of values for x and y that are always the same on the same line （for example， “x=1， y=1”. In addition， each value appears only for once （for example， “x=1， y=1” followed by “x=2， y=2”）.
考题
public class X implements Runnable { private int x； private int y； public static void main（String [] args） { X that = new X（）； （new Thread（ that ））.start（）； （new Thread（ that ））.start（）； } public void run（） { for （；；） { synchronized （this） { x++； y++； } System.out.println（Thread.currentThread（）.getName（） + “x = “ + x + “， y = “ + y）； } } } What is the result？（） A、 Compilation fails.B、 The program prints pairs of values for x and y that might not always be the same on the same line （for example， “x = 2， y = 1”）.C、 The program prints pairs of values for x and y that are always the same on the same line （for example， “x = 1， y = 1”）. In addition， each value appears only once （for example， “x = 1， y = 1” followed by “x = 2， y = 2”）. The thread name at the start of the line shows that both threads are executing concurrently.D、 The program prints pairs of values for x and y that are always the same on the same line （for example， “x = 1， y = 1”）. In addition， each value appears only once （for example， “x = 1， y = 1” followed by “x = 2， y = 2”）. The thread name at the start of the line shows that only a single thread is actually executing.
考题
public class X implements Runnable （ private int x； private int y； public static void main（String args） （ X that = new X（）； （new Thread（that）） . start（ ）； （new Thread（that）） . start（ ）； ） public synchronized void run（ ） （ for （；；） （ x++； y++； System.out.printIn（“x = “ + x + “， y = “ + y）； ） ） ） What is the result？（）A、 An error at line 11 causes compilation to fail.B、 Errors at lines 7 and 8 cause compilation to fail.C、 The program prints pairs of values for x and y that might not always be the same on the same line （for example， “x=2， y=1”）D、 The program prints pairs of values for x and y that are always the same on the same line （forexample， “x=1， y=1”. In addition， each value appears twice （for example， “x=1， y=1” followed by “x=1， y=1”）E、 The program prints pairs of values for x and y that are always the same on the same line （for example， “x=1， y=1”. In addition， each value appears twice （for example， “x=1， y=1” followed by “x=2s， y=2”）
考题
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考题
多选题If x and y are both positive even integers, which of the following expressions must be even? (Select all such expressions.)AxyB(x+1)yCx(y+1)
考题
单选题public class X implements Runnable { private int x； private int y； public static void main（String [] args） { X that = new X（）； （new Thread（ that ））.start（）； （new Thread（ that ））.start（）； } public void run（） { for （；；） { synchronized （this） { x++； y++； } System.out.println（Thread.currentThread（）.getName（） + “x = “ + x + “， y = “ + y）； } } } What is the result？（）A
Compilation fails.B
The program prints pairs of values for x and y that might not always be the same on the same line （for example， “x = 2， y = 1”）.C
The program prints pairs of values for x and y that are always the same on the same line （for example， “x = 1， y = 1”）. In addition， each value appears only once （for example， “x = 1， y = 1” followed by “x = 2， y = 2”）. The thread name at the start of the line shows that both threads are executing concurrently.D
The program prints pairs of values for x and y that are always the same on the same line （for example， “x = 1， y = 1”）. In addition， each value appears only once （for example， “x = 1， y = 1” followed by “x = 2， y = 2”）. The thread name at the start of the line shows that only a single thread is actually executing.
考题
单选题For all real values of x and y, let x◆y be defined by the equation x◆y = 2 -xy. If -1 a 0 and 0 b 1, then which of the following must be true?A
-2a+b-1B
-la+b0C
0a+blD
la+b2E
2a+b3
考题
单选题1. public class X implements Runnable（ 2. private int x； 3. private int y； 4. 5. public static void main（String[]args） 6. X that = new X（）； 7. （new Thread（that））.start（）； 8. （new Thread（that））.start（）； 9. ） 10. 11. public void run（） （ 12. for （；；） （ 13. x++； 14. y++； 15. System.out.printIn（“x=” + x + “， y = ” + y）； 16. ） 17. ） What is the result？（）A
Errors at lines 7 and 8 cause compilation to fail.B
The program prints pairs of values for x and y that might not always be the same on the same line （for example， “x=2， y=1”）.C
The program prints pairs of values for x and y that are always the same on the same line （for example， “x=1， y=1”. In addition， each value appears twice （for example， “x=1， y=1” followed by “x=1， y=1”）.D
The program prints pairs of values for x and y that are always the same on the same line （for example， “x=1， y=1”. In addition， each value appears only for once （for example， “x=1， y=1” followed by “x=2， y=2”）.
考题
单选题public class X implements Runnable（ private int x； private int y； public static void main（Stringargs） X that = new X（）； （new Thread（that））.start（）； （new Thread（that））.start（）； ） public void run（） （ for （；；） （ x++； y++； System.out.printIn（“x=” + x + “， y = ” + y）； ） ） What is the result？（）A
Errors at lines 7 and 8 cause compilation to fail.B
The program prints pairs of values for x and y that might not always be the same on the same line （for example， “x=2， y=1”）.C
The program prints pairs of values for x and y that are always the same on the same line （for example， “x=1， y=1”. In addition， each value appears twice （for example， “x=1， y=1” followed by “x=1， y=1”）.D
The program prints pairs of values for x and y that are always the same on the same line （for example， “x=1， y=1”. In addition， each value appears only for once （for example， “x=1， y=1” followed by “x=2， y=2”）.
考题
单选题If each of the equations below is graphed on the xy-plane, which one will produce a line with a positive slope containing the point (3, 2)?A
x+y=5B
x - y = 1C
3x-2y = 10D
x2 -y=5E
x +y2 = 7
考题
单选题已知y1（x）与y2（x）是方程y″+P（x）y′+Q（x）y=0的两个线性无关的特解，Y1（x）和Y2（x）分别是是方程y″+P（x）y′+Q（x）y=R1（x）和y″+P（x）y′+Q（x）y=R2（x）的特解。那么方程y″+P（x）y′+Q（x）y=R1（x）+R2（x）的通解应是：（）A
c1y1+c2y2B
c1Y1（x）+c2Y2（x）C
c1y1+c2y2+Y1（x）D
c1y1+c2y2+Y1（x）+Y2（x）
考题
单选题If x and y are positive numbers greater than 1, and wx/y+w =1 then w= ______.A
(x-1)/(y-1)B
y/(x-1)C
(x+1)/yD
(x-y)/(x+y)E
y/(x+1)
考题
单选题X = {-4,-2, 1,3}, Y= {-1,4,5}. If x is a number from set X, and y is a number from set Y. The probability that x + y is positive is closest to ______.A
0.5B
0.6C
0.7D
0.8E
0.9
考题
单选题Let @ represent one of the four basic arithmetic operations such that, for any nonzero real numbers P and Q, P @ 0=P and P @ Q=Q @ P. Which arithmetic operation(S) does the symbol @ represent?A
×onlyB
+onlyC
-onlyD
-and×E
+and÷
考题
单选题Phil has x quarters, y dimes, and z nickels and nothing else. Which of the following expressions represents the amount of money that Phil has, in dollars?A
0.25x + 0.10y + 0.05zB
2.5x + 1. 0y + 0.5zC
25x + 10y + 5zD
0.25x + 0.10y + 0.5zE
25x + 10y + 50z
考题
单选题public class X implements Runnable （ private int x； private int y； public static void main（String [] args） （ X that = new X（）； （new Thread（that）） . start（ ）； （new Thread（that）） . start（ ）； ） public synchronized void run（ ） （ for （；；） （ x++； y++； System.out.printIn（“x = “ + x + “， y = “ + y）； ） ） ） What is the result？（）A
An error at line 11 causes compilation to fail.B
Errors at lines 7 and 8 cause compilation to fail.C
The program prints pairs of values for x and y that might not always be the same on the same line （for example， “x=2， y=1”）D
The program prints pairs of values for x and y that are always the same on the same line （for example， “x=1， y=1”. In addition， each value appears twice （for example， “x=1， y=1” followed by “x=1， y=1”）E
The program prints pairs of values for x and y that are always the same on the same line （for example， “x=1， y=1”. In addition， each value appears twice （for example， “x=1， y=1” followed by “x=2s， y=2”）
考题
单选题If 0ab3c4, then which of the following must be true?Ⅰ. ab is positiveⅡ. ab is negativeⅢ. abc is negativeA
Ⅰ onlyB
Ⅱ onlyC
Ⅲ onlyD
Ⅰ and Ⅲ onlyE
Ⅱ and Ⅲ only
考题
单选题X= {1, 2, 4} Y= {1, 3, 4}12 If, in the sets above, x is any number in set X and y is any number in set Y, how many different values of x+y are possible?A
FiveB
SixC
SevenD
EightE
Nine
考题
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
IB
I and IIC
I and IIID
II and III
考题
问答题What is the average (arithmetic mean) of x and y? (1) The average of x+3 and y+5 is 14. (2) The average of x,y and 16 is 12.
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