（4）lim _(xarrow infty )dfrac ({3)^x+4cdot (2)^x}({2)^x-3cdot (5)^x}

3.求下列极限:-|||-(1) lim _(xarrow 2)dfrac ({x)^2-3x-4}({x)^2-4} =-|||-(3) lim _(xarr

3.求下列极限:-|||-(1) lim _(xarrow 2)dfrac ({x)^2-3x-4}({x)^2-4} :-|||-(3) lim _(xarr

(单选题)lim _(xarrow infty )((dfrac {x-4)(x))}^2x=____lim _(xarrow infty )((dfrac {

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

lim _(xarrow infty )dfrac (3{x)^2+5}(5x+3)sin dfrac (2)(x)= __

lim _(xarrow infty )dfrac (sqrt {{x)^2+5}-3}({x)^2}--|||-○

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

int dfrac (2cdot {3)^x-5cdot (2)^x}({3)^x}dx-|||-__；；

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

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