多选题Select all the values of x which make the following true: 2x4 = 7x3 + 4x2.A0B-1/2C-1D2E4
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
参考解析
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。
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。
相关考题：
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.
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.
Which two statements are true regarding the starting of the database instance using the following command?()SQLSTARTUP 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.
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
Which of the following IP addresses is a private IP address? Select all that apply.() A.12.0.0.1B.168.172.19.39C.172.20.14.36D.172.33.194.30E.192.168.42.34
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 interfacesB、Traditionally used as a standalone device for inter-VLAN communicationC、Makes use of TCAMsD、Uses subinterfaces to define trunksE、Can use both Layer 2 and Layer 3 to make forwarding decisionsF、Allows the definition of Switched Virtual Interfaces（SVI）
Which of the following is true regarding Label Distribution Protocol （LDP）？（）A、It is a label distribution protocol for MPLSB、It is a set of procedures and messages by which LSRs establish Label Switch Paths （LSPs） through a networkC、Tag distribution Protocol （TDP） was the basis for LDPD、All of the above are true
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
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 staffB、SELECT DISTINCT dept FROM staffC、SELECT (dept) UNIQUE FROM staffD、SELECT (dept) DISTINCT FROM staff
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.
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
Which two statements are true regarding the starting of the database instance using the following command？（） SQLSTARTUP 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.
多选题Which of the following statements are true？（）AThe equals（） method determines if reference values refer to the same object.BThe == operator determines if the contents and type of two separate objects match.CThe equals（） method returns true only when the contents of two objects match.DThe class File overrides equals（） to return true if the contents and type of two separate objects match.
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?（）AINSERT INTO tab1 SELECT cx, cy FROM tab2BINSERT INTO tab1 VALUES (tab2.cx, tab2.cy)CINSERT INTO tab1 VALUES (SELECT cx, cy FROM tab2)DINSERT INTO tab1 (c1, c2) VALUES (SELECT cx, cy FROM tab2)
多选题If x=6y, then which of the following expressions is a multiple of x? (Select all such expressions.)A3yB12yC30y
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)
多选题If p and q are primes greater than 2, which of the following statements must be true? (Indicate all such statements.)Ap + q is evenBpq is oddCp2-q2 is even
多选题Concerning the figure below, if a =b, which of the following statements must be true? (Indicate all such statements.)Ac=dBl and k are parallelCm and l are perpendicular
多选题Which of the following statements are true? (Indicate all such statements.)Aτ(5) =τ(7)Bτ(5) τ(7) =τ(35)Cτ(5) + τ(7) =τ(12)
多选题Which of the following statements are true for routers but not true for Layer 3 Ethernet switches？（Choose all that apply.）（）AMay have Ethernet as well as non-Ethernet interfacesBTraditionally used as a standalone device for inter-VLAN communicationCMakes use of TCAMsDUses subinterfaces to define trunksECan use both Layer 2 and Layer 3 to make forwarding decisionsFAllows the definition of Switched Virtual Interfaces（SVI）
多选题Which of the following IP addresses is a private IP address? Select all that apply.（）A12.0.0.1B168.172.19.39C172.20.14.36D172.33.194.30E192.168.42.34
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+b0C0a+blDla+b2E2a+b3
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?（）AA must contain all of the characters defined in BBA must be UnicodeCThe encoded values in A must match the encoded values in B for all characters defined in BDA must be a multibyte character setEThe encoded values in A must match the encoded values in B for all numeric and alphabetic characters in B
单选题Which statement is true regarding the INTERSECT operator?（）AIt ignores NULL values BReversing the order of the intersected tables alters the result CThe names of columns in all SELECT statements must be identical DThe number of columns and data types must be identical for all SELECT statements in the query
多选题Which two statements are true regarding the starting of the database instance using the following command?（） SQLSTARTUP UPGRADEAIt enables all system triggers.BIt allows only SYSDBA connections.CIt ensures that all job queues remain active during the upgrade process.DIt sets system initialization parameters to specific values that are required to enable database upgrade scripts to be run.
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).AToner cartridgeBLaser scannerCFormatter PCBDPickup rollersEFuser
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.