求极限~limx→∞ ln x+5/√x^2+1
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求极限~limx→∞ ln x+5/√x^2+1
RT~
RT~
limx→∞ ln (x+5)/√(x^2+1)(这是∞/∞型,运用洛必达法则得)
=limx→∞ 1/[(x+5)*2x/2√(x^2+1)]
=limx→∞ √(x^2+1)/[(x+5)*x]=0
再问: 啊~题目是这样的~ 求解答~limx→∞ ln (x+5/√x^2+1)
再答: limx→∞ ln (x+5/√x^2+1) =limx→∞ ln √[(x^2+10x+25)/(x^2+1)] =limx→∞ 1/2ln[(x^2+10x+25)/(x^2+1)] =limx→∞ 1/2ln[1+(10x+24)/(x^2+1)] =limx→∞ 1/2ln(1+0) =0
=limx→∞ 1/[(x+5)*2x/2√(x^2+1)]
=limx→∞ √(x^2+1)/[(x+5)*x]=0
再问: 啊~题目是这样的~ 求解答~limx→∞ ln (x+5/√x^2+1)
再答: limx→∞ ln (x+5/√x^2+1) =limx→∞ ln √[(x^2+10x+25)/(x^2+1)] =limx→∞ 1/2ln[(x^2+10x+25)/(x^2+1)] =limx→∞ 1/2ln[1+(10x+24)/(x^2+1)] =limx→∞ 1/2ln(1+0) =0
求极限~limx→∞ ln x+5/√x^2+1
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