lim(n-无穷)=3n^2/5n^2+2n-1,

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lim(n->无穷)[(1+3+5+.(2n+1)]/n^2]^(3-2n)
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lim(n->无穷)[(3n^2+cn+1)/(an^2+bn)-4n]=5
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lim(2^n+3^n)/[2^(n+1)+3^(n+1)] x->无穷极限值
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lim(n->无穷)(1/4n^2-2^2+2/4n^2-3^2+...+n-1/4n^2-n^2)