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求lim(x→0)x cos 1/x lim(x→∞)x^2/ (3x-1)的极限
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求极限lim(x→∞)[(2x+5)/(2x+3)]^(x+1)
求极限 lim [(3+x)/(6+x)]^[(x-1)/2]= x→∞
求极限:1.lim(x→∞) (3x^2 -2)/(x^4 +x^2 -1) 2.lim(x→∞) (4x^4 -2x^