【判断题】【消耗次数:1】
若A-B=B-A, 则A=B。
正确
错误
参考答案:
复制
纠错
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】 21. Study hard, _____ you will pass the exam.
①  and
②  or
③  yet
④  but
【单选题】 24.There is no doubt ___the company has made the right decision on the sales project.
①  why  
②  that 
③  whether  
④  when
【单选题】 5.He has a nice collection of _______ stamps.
①  rare
②  . scarce
③  short
④  . few
【单选题】 9. The goal is to keep this land alive, to ______ animal population and keep it growing.
①  insist
②  keep
③  preserve
④  kill
【单选题】 15. Let’s go to the movies, _____?
①  shall we
②  shall you
③  will we
④  will you
【单选题】 12.To make him stay, the manager _______him a pay rise.
①  gave
②  declared
③  promised
④  assured
【单选题】 20. Sometimes we might see a person’s _____world from his behavior.
①  inside
②  inner
③  in
④  within
【单选题】 1.The authors purpose of writing
①  To show the authors grandparents were honest.
②  To explain what Integrity Triad realy embodies.
③  To demonstrate the authors grandparents motto
【单选题】 23.The customer expressed her ___for that broad hat.
①  disapproval 
②  distaste  
③  dissatisfaction 
④  dismay
【单选题】 11.The United Nations managed to ______millions of people from hunger last year.
①  preserve
②  sell
③  save
④  . buy