MATEMATKA. ZADANIE W ZAŁĄCZNIKU ! :) DAJE NAJ ! :) PILNE :)  PS Zadanie 4 ;) 

a) [latex] frac{(2k+1)+(2k-1)}{2} = frac{4k}{2} =2k[/latex] b) [latex] frac{(2k-3)+(2k+1)+(2k+5)}{3}= frac{6k+3}{3} = frac{3(2k+1)}{3} =2k+1[/latex] c) 2k,2k+1,2k+2 [latex] frac{2k+(2k+1)+(2k+2)}{3} = frac{6k+3}{3} = frac{3(2k+1)}{3} =2k+1[/latex]