问题 填空题

命题“∃x∈R,2x+x2≤1”的否定是 ______命题(选填“真命题”或“假命题”)

答案

∵原命的否定为∀x∈R,2x+x2>1,

∴取x=0,则20+02=1,故它是假命题,

故答案为:假.

多项选择题
材料题

阅读材料、回答问题:

        材料一:

       材料二:“查前清官厅视官等高下,有大人、老爷等名称,爱之者增惭,施之者失体,殊为共和政体之玷”。 ──孙中山    

请回答:

(1)根据表格提供的信息,请你判断反映的是什么现象?

                                                                                                                                                             

(2)结合课本所学基础知识,请你分析一下发生这种变化的主要原因有哪些?

                                                                                                                                                             

(3)孙中山以临时大总统的名义颁布剪辫令,这是为什么?

                                                                                                                                                            

                                                                                                                                                            

(4)孙中山对材料二现象的认识是什么?

                                                                                                                                                             

(5)根据材料一,请你谈谈中华民国临时政府是怎样对待这种现象的?说明了什么?