Matematyka z +
zadanie 10 str 88 :
Oblicz średnią arytmetyczną kwadratów liczb n-1,n,n+1
[(n-1)^2+n^2+(n+1)^2]/3=
[n^2-2n+1+n^2+n^2+2n+1]/3=
(3n^2+2)/3=n^2+2/3
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[(n-1)^2+n^2+(n+1)^2]/3=
[n^2-2n+1+n^2+n^2+2n+1]/3=
(3n^2+2)/3=n^2+2/3