Nicolekot

1) a^2+ 2/7a+1/49

2)1/81+2/9a+a^2

3) n^2/16+mn/6+m^2/9

4)k^2/4-kt/5+t^2/25

5) 169/9-26/3x+x^2

6) y^2+13/2y+169/16

7) z^2-52/5z+676/25

8)81/4+9t+t^2