求极限,第二步是如何得出的?请详细点
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(3+x)/(6+x) = 1- 3/(6+x)
let
1/y =3/(6+x)
lim(x->∞) [(3+x)/(6+x)]^[(x-1)/2]
=lim(x->∞) [1- 3/(6+x)]^[(x-1)/2]
=lim(y->∞) (1- 1/y)^[(3y-6-1)/2]
=lim(y->∞) (1- 1/y)^[(3/2)y-7/2]
=lim(y->∞) (1- 1/y)^[(3/2)y]
=e^(-3/2)
let
1/y =3/(6+x)
lim(x->∞) [(3+x)/(6+x)]^[(x-1)/2]
=lim(x->∞) [1- 3/(6+x)]^[(x-1)/2]
=lim(y->∞) (1- 1/y)^[(3y-6-1)/2]
=lim(y->∞) (1- 1/y)^[(3/2)y-7/2]
=lim(y->∞) (1- 1/y)^[(3/2)y]
=e^(-3/2)
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