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设集合,,则 ( ) A. B.M C.Z D.{0}

设集合6ec8aac122bd4f6e6ec8aac122bd4f6e,则6ec8aac122bd4f6e                           (    )

 

A.6ec8aac122bd4f6e                        B.M                          C.Z                         D.{0}

 

 

C 【解析】故选C
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给出以下四个命题:

(1)若6ec8aac122bd4f6e,则x=2或x=3;

(2)若2≤x<3,则(x-2)(x-3) ≤0;

(3)若a=b=0,则|a|+|b|=0;

(4)若x,y∈N,x+y是奇数,则x,y中一个是奇数,一个是偶数.那么(    )      

A.(4)的逆命题假         B.(1)的逆命题真  

C.(2)的否命题真                                       D.(3)的否命题假

 

 

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已知集合6ec8aac122bd4f6e6ec8aac122bd4f6e,若6ec8aac122bd4f6e,则实数6ec8aac122bd4f6e应该满足的条件是(    )                         

A.6ec8aac122bd4f6e                      B.6ec8aac122bd4f6e                  C.6ec8aac122bd4f6e              D.6ec8aac122bd4f6e

 

 

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已知全集6ec8aac122bd4f6e6ec8aac122bd4f6e6ec8aac122bd4f6e

6ec8aac122bd4f6e,则   (    )                                                       

A.6ec8aac122bd4f6e                     B. 6ec8aac122bd4f6e           C.6ec8aac122bd4f6e             D.6ec8aac122bd4f6e

 

 

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在①.16ec8aac122bd4f6e{0,1,2,3};②.{1}∈{0,1,2,3};③.{0,1,2,3}6ec8aac122bd4f6e{0,1,2,3};

④.6ec8aac122bd4f6e{0}上述四个关系中,错误的个数是:                                        (    )

A.1个                        B.2个                    C.3个                       D.4个

 

 

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设集合6ec8aac122bd4f6e的真子集个数是(    )                                           

A.14                          B.15                     C.16                     D.17

 

 

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