【判断题】【消耗次数:1】
若A-B=B-A, 则A=B。
正确
错误
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相关题目
【判断题】 A.B为任意随机事件,则P(A-B)=P(A)-P(B).
①  正确
②  错误
【单选题】 设 A = {1, 22, 43, 3},B = {1, 32, 44, 2},则差关系A-B的域fld(A-B)等于:
①  {1,3};
②  {1,2,4};
③  {1,2,3};
④  {2,3}.
【判断题】 设a,b是整数,若a|b,则[a,b]=|b|.
①  正确
②  错误
【简答题】 若a|b,则(a,b)=[填空].
【判断题】 若A∪B= A∪C, 则B=C。
①  正确
②  错误
【单选题】 若集合A={偶数},B={奇数},则A∩B( )
①  {0}
②  ?
③  {整数}
④  {整数集}
【判断题】 若a=bq+r,则(a,b)=(b,r).
①  正确
②  错误
【判断题】 对于任意的整数a,b,c,若b|ac,则b|a.
①  正确
②  错误
【判断题】 两事件A、B若满足P(A+B)=P(A)+P(B),则称A、B独立
①  正确
②  错误
【单选题】 设 A = {1, 22, 43, 3},B = {1, 32, 44, 2},则差关系A-B等于:
①  {1,21,32,43,34,2
②  {2,4
③  {1,21,33,34,2
④  {1,23,3}.
随机题目
【单选题】 After the break, the class resumed with ( ) spirit.
①  renewed
②  recurred
③  recalled
④  repayed
【单选题】 Dont waste your time on these ( ) things.
①  trivial
②  triviality
③  trivialize
④  small
【单选题】 Water seeped from a ( ) in the pipe.
①  crack
②  cracking
③  cracker
④  cracked
【单选题】 Because the police officers phone seemed to be ( ),the witness could not report the case in time.
①  disconnected
②  depressed
③  seperated
④  split
【单选题】 The people had to ( ) a campaign to combat hatred against colored races.
①  launch
②  set
③  settle
④  lash
【单选题】 The husbands ( ) response to the problems in no way helped his marriage.
①  mature
②  young
③  naive
④  juvenile
【单选题】 Each nation need its own noble and ( ) father-figure.
①  popular
②  gentle
③  honourable
④  generous
【单选题】 Evaluation is part of the basic( ) of the project.
①  dynamics
②  dynamism
③  dynamical
④  dynamic
【单选题】 I braced myself for the ( ) blast.
①  evitable
②  inevitably
③  inevitability
④  inevitable
【单选题】 In such an emergency, one has no time to think carefully but to act ( ).
①  exactly
②  precisely
③  hastily
④  instinctively