关于高数极限证明的几道题 证明 1.lim(xn)=n^2/(2n^3+1)=0 2.lim(3n+1)/(2n-1)=3/2 3.lim2^n/n!=0第一题中ξ=0.1,0.01,0.001时的N值要怎么求呢!

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