参考答案和解析
正确答案: 18
解析:
根据题干得知x+9= 1.5x,减9,则9=0.5x。两边乘2,则18=x。
更多“If x + 9 is 50% greater than x, then what is the value of x?”相关问题
  • 第1题:

    类MyClas的定义如下: class MyClas{ public: MyClas(){} MyClas(int a){ value=new.int(i); } int *value; }; 若要对类中的value赋值,则下面的语句中正确的是( )

    A.MyClas x;x.value=10;

    B.MyClas x; *x.value=10;

    C.MyClas x;x. *value=10;

    D.MyClas x(10);


    正确答案:D
    解析:选项A中,直接对地址赋值,因此选项A是错误的;c++中不能对未初始化的指针变量赋值,因此选项B是错误的;选项C有语法错误;选项D通过调用类的构造函数给value赋初值10。

  • 第2题:

    When is the connection concentrator enabled?()

    • A、When the value of MAX_CONNECTIONS is greater than the value of MAX_COORDAGENTS.  
    • B、When the value of MAX_AGENTS is greater than the value of MAX_CLIENTS.  
    • C、When the value of NUM_AGENTS is greater than the value of MAX_AGENTS. 
    • D、When the value of NUM_CONNECTIONS is greater than the value of NUM_COORDAGENTS.

    正确答案:A

  • 第3题:

    What should the configuration register value be after successfully completing the password recover procedure and returning the router to normal operation? ()

    • A、0x2100
    • B、0x2101
    • C、0x2102
    • D、0x2124
    • E、0x2142

    正确答案:C

  • 第4题:

    单选题
    If t is 40 percent greater than p, and p is 40 percent less than 600, what is the value of t-p?
    A

    144

    B

    240

    C

    360

    D

    504

    E

    1008


    正确答案: A
    解析:
    因为p的值比600少40%,所以p=600(0.60)=360,t比p大40%,所以t=1.40p=1.40(360)=504,所以t-p=504-360=144。

  • 第5题:

    填空题
    If the function f is defined by f(x)= (2x-4)/3 for what value of x does f(x) = 18?____

    正确答案: 29
    解析:
    因为f(x)= (2x-4)/ 3=18,2x - 4 = 54,x = 29。

  • 第6题:

    单选题
    DS2 has not become the active device for Vlan103’s HSRP group even though all interfaces are active. As related to Vlan103’s HSRP group.  What can be done to make the group function properly ? ()
    A

     On DS1, disable preempt

    B

     On DS1, decrease the priority value to a value less than 190 and greater than 150

    C

     On DS2, increase the priority value to a value greater 241 and less than 249

    D

     On DS2, increase the decrement value in the track command to a value greater than 10 and less than 50.


    正确答案: A
    解析: 暂无解析

  • 第7题:

    单选题
    If 2x-3y = 11 and 3x+15 = 0, what is the value of y?
    A

    -7

    B

    -5

    C

    1/3

    D

    3

    E

    10


    正确答案: A
    解析:
    First solve the equation that contains one variable. Since 3x+15 = 0, then 3x = -15, so x = -15/3 = -5. Substituting -5 for x in the other equation, 2x-3y = 11, gives 2(-5)-3y = 11 or -10-3y = 11. Adding 10 to both sides of the equation makes -3y = 21, so y = -21/3 = -7.

  • 第8题:

    单选题
    If 5/x+4/5=1, what is the value of x?
    A

    -25/4

    B

    -4

    C

    -5/4

    D

    -1/5

    E

    25


    正确答案: A
    解析:
    Multiply by 5x to clear fractions. 25+4x=5x, x=25

  • 第9题:

    单选题
    What is the smallest integer value of x that satisfies the inequality 4-3x < 11?
    A

    -3

    B

    -2

    C

    -1

    D

    0

    E

    1


    正确答案: B
    解析:
    Solution 1: If 4-3x < 11, then -3x < 7, so x > -7/3. Since -7/3 is between -2 and -3, the smallest integer value of x that satisfies this inequality is -2. Solution 2: Plug each of the answer choices for x, starting with A., into 4-3x < 11 until you find one that makes the inequality a true statement. Choice A. gives 4-3(-3) < 11, 13 < 11 which is not a true statement. Choice B. gives 4-3(-2) < 11, 10 < 11 which is true, so there is no need to continue.

  • 第10题:

    单选题
    public class SwitchTest {   public static void main (String args) {   System.out.PrintIn(“value =” +switchIt(4));   }   public static int switchIt(int x) {   int j = 1;   switch (x) {   case 1: j++;   case 2: j++;   case 3: j++;  case 4: j++;   case 5: j++;   default:j++;   }   return j + x;   }   }   What is the output from line 3? ()
    A

     Value = 3

    B

     Value = 4

    C

     Value = 5

    D

     Value = 6

    E

     Value = 7

    F

     Value = 8


    正确答案: C
    解析: 暂无解析

  • 第11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)/y

    D

    (x-y)/(x+y)

    E

    y/(x+1)


    正确答案: A
    解析:
    因为wx/(y+w) =1,所以wx = y + w,则wx-w = yw (x-1) = yw = y/(x-1),故选B。

  • 第12题:

    填空题
    Let f(x) be defined as the absolute value of the difference between the smallest and largest odd factors of x greater than 1. For example, f(42)=︱3-21︱=18. What is the value of f(90)?____

    正确答案: 42
    解析:
    90最大的奇因数为45,最小的奇因子为3,所以f(90)=45-3=42。

  • 第13题:

    What should the configuration register value be after successfully completing the password recover procedure and returning the router to normal operation? ()

    A.0x2100

    B.0x2101

    C.0x2102

    D.0x2124

    E.0x2142


    参考答案:C

  • 第14题:

    public class SwitchTest {  public static void main(String[] args) {  System.out.println(“value = “ + switchIt(4));  }  public static int switchIt(int x) {  int j = 1;  switch (x) {  case 1: j++; case 2: j++;  case 3: j++;  case 4: j++;  case 5: j++;  default: j++;  }  return j + x; }  }  What is the result?()  

    • A、 value = 3
    • B、 value = 4
    • C、 value = 5
    • D、 value = 6
    • E、 value = 7
    • F、 value = 8

    正确答案:F

  • 第15题:

    问答题
    In the figure below, what is the value of x?

    正确答案: 54
    解析:
    根据图示可知,三角形的两边为圆的半径,是等腰三角形,所以有180=72+2x→x=54.

  • 第16题:

    单选题
    For what value of p is (x-2)(x+2) = x(x -p)?
    A

    -4

    B

    0

    C

    2/x

    D

    4/x

    E

    -x/4


    正确答案: D
    解析:
    Multiply on each side of the given equation, (x - 2)(x + 2) = x(x -p). The result is x2 - 4 = x2xp, so 4 = xp and p = 4/x.

  • 第17题:

    问答题
    What is the value of x-y?  (1) (x-y)2=25  (2) 4x=4 (y+3)

    正确答案: B
    解析:
    条件1不能确定x-y的值,由条件2可知,x-y=3,故本题选B项。

  • 第18题:

    问答题
    If x+y=36, what is the value of xy?  (1) y-x=14  (2) y=2x+3

    正确答案: D
    解析:
    分别将两个条件代入题目,可以计算出x=11,y=25,故本题应选D项。

  • 第19题:

    单选题
    If x is an integer and y=7x+11, what is the greatest value of x for which Y is less than 50?
    A

    7

    B

    6

    C

    5

    D

    4

    E

    3


    正确答案: A
    解析:
    解答这道题的快速方法是把选项中的数值依次代入方程式,计算y的数值,直到满足条件y<50为止,即可得出答案。

  • 第20题:

    单选题
    If x-9 = 2y and x+3 = 5y, what is the value of x?
    A

    -2

    B

    4

    C

    11

    D

    15

    E

    17


    正确答案: C
    解析:
    Subtract corresponding sides of the two given equations: x+3=5y, x- 9= 2y →0+ 12=3y. 12/3 = y or y=4. Since y= 4 and x + 3 = 5y, then x + 3 = 5(4) = 20, so x=20-3=17.

  • 第21题:

    单选题
    What should the configuration register value be after successfully completing the password recover procedure and returning the router to normal operation? ()
    A

    0x2100

    B

    0x2101

    C

    0x2102

    D

    0x2124

    E

    0x2142


    正确答案: A
    解析: 暂无解析

  • 第22题:

    单选题
    What is the least possible value of (x+1)2 if -2≤x≤3?
    A

    -2

    B

    3

    C

    -1

    D

    0

    E

    1


    正确答案: E
    解析:
    Since (x+1) 2 is the square of a number, the least possible square of a real number must be 0.

  • 第23题:

    单选题
    You are the administrator of the Testking network and you have forgotten the password to one of your routers. After completing the password recovery procedure the router returned to its normal operation. The config-register was set back to the initial default value. What is this value?()
    A

    0x2112

    B

    0x2104

    C

    0x2102

    D

    0x2142

    E

    0x2100


    正确答案: C
    解析: 暂无解析