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不等式的解集是 .

不等式6ec8aac122bd4f6e的解集是                        

 

 

或 【解析】由利用标根序轴法可得 或.
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已知全集U = R,不等式6ec8aac122bd4f6e的解集A,则6ec8aac122bd4f6e                    

 

 

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已知集合A={6ec8aac122bd4f6e,6ec8aac122bd4f6e,2},B={2,6ec8aac122bd4f6e,26ec8aac122bd4f6e}且,6ec8aac122bd4f6e=6ec8aac122bd4f6e,则6ec8aac122bd4f6e=               

 

 

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不等式6ec8aac122bd4f6e的解集为R,则6ec8aac122bd4f6e的取值范围是(    )             

A.6ec8aac122bd4f6e                                   B.6ec8aac122bd4f6e  

C.6ec8aac122bd4f6e                                    D.6ec8aac122bd4f6e

 

 

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6ec8aac122bd4f6e时,关于6ec8aac122bd4f6e的不等式6ec8aac122bd4f6e的解集是(    )         

A.{6ec8aac122bd4f6e6ec8aac122bd4f6e6ec8aac122bd4f6e}                          B.{6ec8aac122bd4f6e6ec8aac122bd4f6e6ec8aac122bd4f6e}   

C.{6ec8aac122bd4f6e6ec8aac122bd4f6e}                              D.{6ec8aac122bd4f6e6ec8aac122bd4f6e}

 

 

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对任意实数a,b,c,给出下列命题:

①“6ec8aac122bd4f6e”是“6ec8aac122bd4f6e”充要条件;

②“6ec8aac122bd4f6e是无理数”是“a是无理数”的充要条件

③“a>b”是“a2>b2”的充分条件;

④“a<5”是“a<3”的必要条件.

其中真命题的个数是           (    )                                                                     

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

 

 

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