计算 lim _(xarrow infty )dfrac ({(2x-2))^2(x-1)}({(x+1))^3+6}=.

求极限：（1）lim _(xarrow 0)dfrac ({e)^2x-2(e)^x+1}({x)^2cos x}；（2）lim _(xarrow 0)dfra

(2) lim _(xarrow infty )((dfrac {x+1)(x-1))}^-dfrac (x{2)}= () ;-|||-(A)1 (B) ^d

lim _(xarrow infty )((dfrac {3+x)(6+x))}^dfrac (x-1{2)}-|||-__

A.lim _(xarrow 1)dfrac ({x)^2+x-2}({x)^2-1}=lim _(xarrow 1)dfrac ((x-1)(x+2))((x

)求下列极限:-|||-(1) lim _(xarrow 1)dfrac ({x)^2-x+1}({(x-1))^2} =-|||-(3) lim _(xarr

(2) lim _(xarrow infty )((dfrac {2x+3)(2x+1))}^x+1;

(3) lim _(xarrow infty )((dfrac {2x+3)(2x+1))}^x+1

(3) lim _(xarrow infty )((dfrac {2x+3)(2x+1))}^x+1;

(3) lim _(xarrow infty )((dfrac {2x+3)(2x+1))}^x+1;

(5) lim _(xarrow infty )((dfrac {3+x)(6+x))}^dfrac (x-1{2)}