多选题Select all the values of x which make the following true: 2x4 = 7x3 + 4x2.A0B-1/2C-1D2E4

题目
多选题
Select all the values of x which make the following true: 2x4 = 7x3 + 4x2.
A

0

B

-1/2

C

-1

D

2

E

4

相似考题

1.Which of the following is true for both bagels and donuts?A. They both came from Europe.B. They are both easy to make.C. They are both sweet.D. People in New York make them best.

2.Which two statements are true regarding the starting of the database instance using the following command?()SQL>STARTUP UPGRADEA. It enables all system triggers.B. It allows only SYSDBA connections.C. It ensures that all job queues remain active during the upgrade process.D. It sets system initialization parameters to specific values that are required to enable database upgrade scripts to be run.

3.Given two different character sets (A and B), which of the following must be true for A to be considered a strict superset of B?()A. A must contain all of the characters defined in BB. A must be UnicodeC. The encoded values in A must match the encoded values in B for all characters defined in BD. A must be a multibyte character setE. The encoded values in A must match the encoded values in B for all numeric and alphabetic characters in B

4.Evaluate the following command:Which statement is true regarding the above command?()A. The LOB matically compressed.B. The LOB values are cached bvalues are autoy default in the buffer cache.C. The LOB values are automatically stored in encrypted mode.D. All LOB data that is identical in two or more rows in a LOB column share the same data blocks.

参考答案和解析
正确答案： B,D
解析：
因为2x4 = 7x3 + 4x2，所以x2(2x2-7x-4)=0，所以x=0或-1/2或4，所以本题应选ABE三项。
更多“多选题Select all the values of x which make the following true: 2x4 = 7x3 + 4x2.A0B-1/2C-1D2E4”相关问题

  • 第1题：

    Which of the following IP addresses is a private IP address? Select all that apply.()

    A.12.0.0.1

    B.168.172.19.39

    C.172.20.14.36

    D.172.33.194.30

    E.192.168.42.34


    参考答案：C, E

  • 第2题：

    Which of the following is true regarding Label Distribution Protocol （LDP）？（）

    • A、It is a label distribution protocol for MPLS
    • B、It is a set of procedures and messages by which LSRs establish Label Switch Paths （LSPs） through a network
    • C、Tag distribution Protocol （TDP） was the basis for LDP
    • D、All of the above are true

    正确答案:D

  • 第3题：

    Which of the following statements eliminates all but one of each set of duplicate rows in the DEPT column in the STAFF table?（）

    • A、SELECT UNIQUE dept FROM staff
    • B、SELECT DISTINCT dept FROM staff
    • C、SELECT (dept) UNIQUE FROM staff
    • D、SELECT (dept) DISTINCT FROM staff

    正确答案:B

  • 第4题：

    Given two different character sets (A and B), which of the following must be true for A to be considered a strict superset of B?（）

    • A、A must contain all of the characters defined in B
    • B、A must be Unicode
    • C、The encoded values in A must match the encoded values in B for all characters defined in B
    • D、A must be a multibyte character set
    • E、The encoded values in A must match the encoded values in B for all numeric and alphabetic characters in B

    正确答案:A,C

  • 第5题：

    多选题
    Which of the following statements are true？（）
    A

    The equals（） method determines if reference values refer to the same object.

    B

    The == operator determines if the contents and type of two separate objects match.

    C

    The equals（） method returns true only when the contents of two objects match.

    D

    The class File overrides equals（） to return true if the contents and type of two separate objects        match.


    正确答案： A,D
    解析： 严格来说这个问题的答案是不确定的，因为equals()方法是可以被重载的，但是按照java语言的本意来说：如果没有重写（override）新类的equals()，则该方法和 == 操作符一样在两个变量指向同一对象时返回真，但是java推荐的是使用equals()方法来判断两个对象的内容是否一样，就像String类的equals()方法所做的那样：判定两个String对象的内容是否相同，而==操作符返回true的唯一条件是两个变量指向同一对象。从这个意义上来说选择给定的答案。从更严格的意义来说正确答案应该只有D。

  • 第6题：

    多选题
    If x=6y, then which of the following expressions is a multiple of x? (Select all such expressions.)
    A

    3y

    B

    12y

    C

    30y


    正确答案： C,B
    解析：
    根据题目中已知的数量关系可知，x必须是6的倍数，选项B和C均符合要求。

  • 第7题：

    多选题
    If p and q are primes greater than 2, which of the following statements must be true? (Indicate all such statements.)
    A

    p + q is even

    B

    pq is odd

    C

    p2-q2 is even


    正确答案： A,B
    解析：
    由于所有大于2的质数都是奇数，因此p和q均是奇数，两奇数相加为偶数，所以A项正确；两奇数的乘积还是奇数，所以B项正确；两奇数的平方还各自是奇数，而两奇数的平方之差是偶数，因此C项也正确；所以选择A、B、C三项。

  • 第8题：

    多选题
    Which of the following statements are true? (Indicate all such statements.)
    A

    τ(5) =τ(7)

    B

    τ(5) τ(7) =τ(35)

    C

    τ(5) + τ(7) =τ(12)


    正确答案： A,B
    解析：
    5和7均只有两个正除数，因此根据题干信息，A项正确；35有四个正除数，所以B项也是正确的；12有6个正除数，因此C项错误；选择A、B两项。

  • 第9题：

    多选题
    Which of the following IP addresses is a private IP address? Select all that apply.（）
    A

    12.0.0.1

    B

    168.172.19.39

    C

    172.20.14.36

    D

    172.33.194.30

    E

    192.168.42.34


    正确答案： D,B
    解析： 暂无解析

  • 第10题：

    多选题
    Given two different character sets (A and B), which of the following must be true for A to be considered a strict superset of B?（）
    A

    A must contain all of the characters defined in B

    B

    A must be Unicode

    C

    The encoded values in A must match the encoded values in B for all characters defined in B

    D

    A must be a multibyte character set

    E

    The encoded values in A must match the encoded values in B for all numeric and alphabetic characters in B


    正确答案： E,D
    解析： 暂无解析

  • 第11题：

    多选题
    Which two statements are true regarding the starting of the database instance using the following command?（） SQL>STARTUP UPGRADE
    A

    It enables all system triggers.

    B

    It allows only SYSDBA connections.

    C

    It ensures that all job queues remain active during the upgrade process.

    D

    It sets system initialization parameters to specific values that are required to enable database upgrade scripts to be run.


    正确答案： C,B
    解析： 暂无解析

  • 第12题：

    单选题
    Evaluate the following command: Which statement is true regarding the above command?（）
    A

    The LOB matically compressed.

    B

    The LOB values are cached bvalues are autoy default in the buffer cache.

    C

    The LOB values are automatically stored in encrypted mode.

    D

    All LOB data that is identical in two or more rows in a LOB column share the same data blocks.


    正确答案： C
    解析： 暂无解析

  • 第13题：

    Which of the following statements are true for routers but not true for Layer 3 Ethernet switches？（Choose all that apply.）（）

    • A、May have Ethernet as well as non-Ethernet interfaces
    • B、Traditionally used as a standalone device for inter-VLAN communication
    • C、Makes use of TCAMs
    • D、Uses subinterfaces to define trunks
    • E、Can use both Layer 2 and Layer 3 to make forwarding decisions
    • F、Allows the definition of Switched Virtual Interfaces（SVI）

    正确答案:A,B,D

  • 第14题：

    Which statement is true regarding the INTERSECT operator?（）

    • A、It ignores NULL values 
    • B、Reversing the order of the intersected tables alters the result 
    • C、The names of columns in all SELECT statements must be identical 
    • D、The number of columns and data types must be identical for all SELECT statements in the query 

    正确答案:D

  • 第15题：

    Evaluate the following command：   SQL> CREATE TABLE design_data （id NUMBER， doc CLOB）  LOB（doc） STORE AS SECUREFILE（DEDUPLICATE）；   Which statement is true regarding the above command？（）  

    • A、 The LOB values are automatically compressed.
    • B、 The LOB values are cached by default in the buffer cache.
    • C、 The LOB values are automatically stored in encrypted mode.
    • D、 All LOB data that is identical in two or more rows in a LOB column share the same data blocks.

    正确答案:D

  • 第16题：

    Which two statements are true regarding the starting of the database instance using the following command？（） SQL>STARTUP UPGRADE  

    • A、 It enables all system triggers.
    • B、 It allows only SYSDBA connections.
    • C、 It ensures that all job queues remain active during the upgrade process.
    • D、 It sets system initialization parameters to specific values that are required to enable database upgrade scripts to be run.

    正确答案:B,D

  • 第17题：

    单选题
    Given the following two tables: TAB1 C1 C2 1 Antarctica 2 Africa 3 Asia 4 Australia TAB2 CX CY 5 Europe 6 North America 7 South America Which of the following SQL statements will insert all rows found in table TAB2 into table TAB1?（）
    A

    INSERT INTO tab1 SELECT cx, cy FROM tab2

    B

    INSERT INTO tab1 VALUES (tab2.cx, tab2.cy)

    C

    INSERT INTO tab1 VALUES (SELECT cx, cy FROM tab2)

    D

    INSERT INTO tab1 (c1, c2) VALUES (SELECT cx, cy FROM tab2)


    正确答案： A
    解析： 暂无解析

  • 第18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

    xy

    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19题：

    多选题
    Concerning the figure below, if a =b, which of the following statements must be true? (Indicate all such statements.)
    A

    c=d

    B

    l and k are parallel

    C

    m and l are perpendicular


    正确答案： C,B
    解析：
    根据题目中的已知信息无法推断出各直线的关系，因此B、C均不正确；而由图示可知，c和d分别是a和b的补角，由于a=b，所以c=d，A项正确。

  • 第20题：

    多选题
    Which of the following statements are true for routers but not true for Layer 3 Ethernet switches？（Choose all that apply.）（）
    A

    May have Ethernet as well as non-Ethernet interfaces

    B

    Traditionally used as a standalone device for inter-VLAN communication

    C

    Makes use of TCAMs

    D

    Uses subinterfaces to define trunks

    E

    Can use both Layer 2 and Layer 3 to make forwarding decisions

    F

    Allows the definition of Switched Virtual Interfaces（SVI）


    正确答案： A,B
    解析： 暂无解析

  • 第21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

    -2<a+b<-1

    B

    -l<a+b<0

    C

    0<a+b<l

    D

    l<a+b<2

    E

    2<a+b<3


    正确答案： B
    解析：
    根据题干，发现a= -1/2, b =1/2满足已知条件，a◆b=2-ab，将a= -1/2, b =1/2代入进去，则(-1/2) ◆(1/2) = 2 - (-1/2)(1/2) = 2 + 1/4 = 2.25，故选E。

  • 第22题：

    单选题
    Which statement is true regarding the INTERSECT operator?（）
    A

    It ignores NULL values 

    B

    Reversing the order of the intersected tables alters the result 

    C

    The names of columns in all SELECT statements must be identical 

    D

    The number of columns and data types must be identical for all SELECT statements in the query 


    正确答案： D
    解析： 暂无解析

  • 第23题：

    多选题
    A user reports that a printer has started producing a repetitive image defect on all printouts. Which of the following are the MOST likely causes of the problem?（） (Select TWO).
    A

    Toner cartridge

    B

    Laser scanner

    C

    Formatter PCB

    D

    Pickup rollers

    E

    Fuser


    正确答案： C,B
    解析： 暂无解析

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