问题 解答题

化简:(2x-1)2-(3x-1)(3x+1)+5x(x-1).

答案

(2x-1)2-(3x-1)(3x+1)+5x(x-1),

=4x2-4x+1-(9x2-1)+5x2-5x,

=4x2-4x+1-9x2+1+5x2-5x,

=-9x+2.

阅读理解与欣赏

石灰吟                               竹  石

                                                      

                                                                 

                                                                 

                                                                 

                                                                 

1.写出这两首诗的作者,并把两首诗补充完整。  

2.这两首诗都用了                  的手法,第一首明写                         ,实际表达了作者自己                 

                                                                  的高尚节操;第二首吟咏                                    ,赞扬了它们                                                                    的精神。  

3.《石灰吟》的“吟”在这里是                  ;“尔”的意思是                   

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