lim(1/1*4+1/4*7+1/7*10..+1/(3n-2)(3n+1)=
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lim(1/1*4+1/4*7+1/7*10..+1/(3n-2)(3n+1)=
lim(1/1*4+1/4*7+1/7*10..+1/(3n-2)(3n+1)=
lim(1/1*4+1/4*7+1/7*10..+1/(3n-2)(3n+1)=
lim(1/1*4+1/4*7+1/7*10..+1/(3n-2)(3n+1)
=lim[1/3(1-1/4)+1/3(1/4-1/7)+.+1/3(1/3n-2-1/3n+1)]
=lim[1/3(1-1/(3n+1))]
=lim[n/(3n+1)]
=lim[1/(3+1/n)]
=1/3
n-->+∞
lim[(4+7+...+3n+1)/(n^2-n)]=
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