求(1)lim2n^2-n+1/n2^+3n (2)limx^2+2x/x^2+4x+1 (3)lim(1/1+x-3/
1个回答
(1)lim2n^2-n+1/n2^+3n =2
(2)limx^2+2x/x^2+4x+1 =∞
(3)lim(1/1+x-3/1+x^3) =-1
(4)limx3/1-√1-x3=2
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