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错误解法 

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例1、            不等式 

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31、(1)___________________。

(2)_________,                                                              

(3)______                           _______________。

(4)_______________

 

 

 

 

 

 

 

 

 

 

 

(5)①________________________________

②___________________________                                            _;

 

___________________________                                              __。

 

 

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30、 I.(1)________、________________

(2)                                               

(3)                               

Ⅱ.(1)_________________________________________________

(2)①:___________________     _____②:_____________           ___________

(3)__________(填“多”或“少”)

 

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28、(1)                  

(2)①              (填写编号,下同)②                                     

 (3)①                                                    

                                                             

            

                                                                

29(1)                            

(2)①              。②               

(3)          

 

                                                                     

(4)

 

                                                   

 

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26、⑴                              

                                                       

                                                       

                                                        

                                                          

⑸____    _______。

27(1)                                                                  

(2)①                                                                

                                                                

(3)                                             

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25、

 

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24、

 

 

 

 

 

 

 

 

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23、

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