lim(x/2)^( x/x-2).x趋向于2!第二题:lim(e^ (x)-1/x).x趋向于0
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lim(x/2)^( x/x-2).x趋向于2!第二题:lim(e^ (x)-1/x).x趋向于0
我对极限十分薄弱
我对极限十分薄弱
(1)
L =lim(x->2 ) (x/2)^( x/(x-2) )
lnL =lim(x->2 ) xln(x/2) /(x-2) (0/0)
=lim(x->2 ) [ ln(x/2) + 1 ]
= 1
L =e^0
=1
ie
lim(x->2 ) (x/2)^( x/(x-2) ) =1
(2)
lim(x->0) (e^(x)- 1 )/x (0/0)
=lim(x->0) e^x
=1
再问: l n L是哪来的??
再问: 步骤有些看不懂
再答: L =lim(x->2 ) (x/2)^( x/(x-2) ) (两边取ln)
lnL =lim(x->2 ) xln(x/2) /(x-2) (0/0)
L =lim(x->2 ) (x/2)^( x/(x-2) )
lnL =lim(x->2 ) xln(x/2) /(x-2) (0/0)
=lim(x->2 ) [ ln(x/2) + 1 ]
= 1
L =e^0
=1
ie
lim(x->2 ) (x/2)^( x/(x-2) ) =1
(2)
lim(x->0) (e^(x)- 1 )/x (0/0)
=lim(x->0) e^x
=1
再问: l n L是哪来的??
再问: 步骤有些看不懂
再答: L =lim(x->2 ) (x/2)^( x/(x-2) ) (两边取ln)
lnL =lim(x->2 ) xln(x/2) /(x-2) (0/0)
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