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b) b(n+1) - b(n) = (n+1)^2 - n^2 = n^2 + 2n + 1 - n^2 = 2n +1 (nie)
c) b(n+1) - b(n) = -2(n+1) + 3 + 2n - 3 = -2n -2 + 3 +2n - 3 = -2 (tak, malejący)
d) b(n+1) - b(n) = (n+4)/(n+1) - (n+3)/n = [n(n+4) - (n+1)(n+3)] / n(n+1) = -3 / (n^2 + n) <- nie jest
e) b(n+1) - b(n) = 1/(n+1) - 1/n = (n - n - 1)/(n^2+n) = -1/(n^2+n) <- nie jest
f) b(n+1) - b(n) = 4 - 1/2*(n+1) - 4 + 1/2*n = (-n-1+n)/2 = -1/2 (tak, malejący)