Matematika 1. 4 sigma i=1 (xi+yi)-1 =
2. 4 sigma i=2 (xi.yi+i) =
3. 5 sigma i=1 xi+1-i²+ 4 sigma y1-i =​

1. 4 sigma i=1 (xi+yi)-1 = 2. 4 sigma i=2 (xi.yi+i) = 3. 5 sigma i=1 xi+1-i²+ 4 sigma y1-i =​ [answer.2.content]