lim x→∞(x-1/x+1)^X/2+4
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lim x→∞(x-1/x+1)^X/2+4
lim x→∞(x-1/x+1)^X/2+4
lim x→∞(x-1/x+1)^X/2+4
(x-1)/(x+1)=1-2/(x+1)
令t=-2/(x+1)
x=-2/t-1
lim x →∞ { [(x-1)/(x+1)]^(x/2+4)}
=lim t→0 {(1+t)^(-1/t-1/2+4)}
=limt→0 {[(1+t)^(7/2)] / [(1+t)^(1/t)]}
= 1/e
+4在哪个位置
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