Sa se determine formula termenului general al sirului definit prin:
c) x1=2, xn+1=xn^2
d) x1=1, xn+1=n/n+1 × xn
e) x1=1, x2=4, xn+1 + x n-1=2(xn+1)
(xn, x1, x2=x indice n, 1, 2 etc, xn+1= x indice n+1, xn^2=x indice n la puterea a doua)

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