计算极限:limx趋向于无穷,[(5x^2+1)/(3x-1)]sin1/x
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极限limx趋向于负无穷,根号下(4X^2+x)*ln(2+1/x)-2ln2*x
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limx趋向无穷 根号x^2-3/3次根号x^3+1的极限