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b) [ (n-2) + (n-1) + n + (n+1) ] / 4 = [4n - 2] / 4 = n - 0,5
[(n-2) + (n-1) +( n) + (n+1)] :4 = n-0.5
[(n+70)+(n+71)+(n+72)+(n+73)]:4 = n+71.5
2)
[(n-2)+(n-1)+( n)+(n+1)]:4 = n-0.5