求极限!分母为零!像lim h→0 ((1+h)^(1/2)-1)/h和lim x→-1 (x^2+2x+1)/(x^4
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设f'(x) = 3^(1/2) ,求 lim(h→0) [f(x+mh) - f(x - nh)] / h ,(m ,
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设f(x)在x=2处可导,且f'(2)=1,则lim h→0 [ f(2+h)-f(2-h)]/h等于多少,
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极限lim(x→0)(1-2/x)^x
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1.4求极限lim(x→∞) (x^2+x)/ (x^4-3x^+1)