极限运算求解
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(1) lim(x->1)(x^3+3x-1) = 1+3 -1 =3
(2) lim(x->1)(x^2-1)/(x-1)=lim(x->1)(x+1) = 1+1 +2
(3) lim(x->0) sin2x/x= lim(x->0) 2x/x =2
(4) lim(x->0) sinx/(3x)= lim(x->0) x/(3x) =1/3
(5)
let
1/y=1/(3x)
lim(x-> ∞) ( 1+ 1/(3x) )^x
=lim(y-> ∞) ( 1+ 1/y )^(y/3)
=e^(1/3)
(2) lim(x->1)(x^2-1)/(x-1)=lim(x->1)(x+1) = 1+1 +2
(3) lim(x->0) sin2x/x= lim(x->0) 2x/x =2
(4) lim(x->0) sinx/(3x)= lim(x->0) x/(3x) =1/3
(5)
let
1/y=1/(3x)
lim(x-> ∞) ( 1+ 1/(3x) )^x
=lim(y-> ∞) ( 1+ 1/y )^(y/3)
=e^(1/3)
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