11 SMA - MATEMATIKA 731

 $\sum_{i=1}^43i\ =\ ....$  

 $\sum_{i=0}^2-5i\ =\ ...$  

 $\sum_{i=-1}^52i\ -1\ =\ ...$  

 $\sum_{k=1}^3k^2=....$  

 $\sum_{k=1}^4k^2-1\ =....$