zbadaj monotonicznosc ciagu an=(2n)/(n+1)
n+1= 2n/n+1= 2(n+1)/n+1+1=2n+2/n+2
(n+1)-(an)= 2n/n+1-(2n+2/(n+2)= 2n/n+1- 2n-2/n-2= 2n-2n-2/(n+1)(n+2) malejący
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n+1= 2n/n+1= 2(n+1)/n+1+1=2n+2/n+2
(n+1)-(an)= 2n/n+1-(2n+2/(n+2)= 2n/n+1- 2n-2/n-2= 2n-2n-2/(n+1)(n+2) malejący