C
congtungok
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
Bài 1
Tính A(x)=x^n+1/(x^n)
Biết x^2+x+1=0
Bai2:
Chứng minh rằng:
1/(1.2)+1/(3.4)+1/(5.6)+...+1/(49.50)=1/26+1/27+1/28+...+1/50![Confused :confused: :confused:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
![Confused :confused: :confused:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
![Confused :confused: :confused:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Tính A(x)=x^n+1/(x^n)
Biết x^2+x+1=0
Bai2:
Chứng minh rằng:
1/(1.2)+1/(3.4)+1/(5.6)+...+1/(49.50)=1/26+1/27+1/28+...+1/50