(1)lim _(xarrow 3)dfrac (sqrt {{x)^3+9}-6}(2-sqrt {{x)^3-23}}=-|||-__-|||-__ _.(2)设lim _(xarrow 3)dfrac (sqrt {{x)^3+9}-6}(2-sqrt {{x)^3-23}}=-|||-__-|||-__，且lim _(xarrow 3)dfrac (sqrt {{x)^3+9}-6}(2-sqrt {{x)^3-23}}=-|||-__-|||-__有连续的二阶偏导数，则lim _(xarrow 3)dfrac (sqrt {{x)^3+9}-6}(2-sqrt {{x)^3-23}}=-|||-__-|||-__ _.

(4) lim _(xarrow 1)dfrac ({x)^2-sqrt (x)}(sqrt {x)-1};

(1)lim_(xto3)(sqrt(x^3)+9-6)/(2-sqrt(x^3)-23)=_____.(1)$\lim_{x\to3}\frac{\sqrt{

lim _(xarrow 4)dfrac (sqrt {2x+1)-3}(sqrt {x-2)-sqrt (2)}=..

[题目]求 lim _(xarrow 2)dfrac (sqrt {3x-2)-2}(sqrt {2x-1)-sqrt (3)}

lim _(xarrow 1)dfrac (sqrt [3]{x)-1}(sqrt {x)-1}=..

求lim _(xarrow 3)dfrac (sqrt {x+1)-2}(x-3)求

(7) lim _(xarrow 3)dfrac (sqrt {x+1)-2}(x-3)

（21）lim _(xarrow 4)dfrac (sqrt {2x+1)-3}(sqrt {x-2)-sqrt (2)}（21）

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

(9)lim _(xarrow 0)dfrac (sqrt {1+5x)-sqrt (1-3x)}({x)^2+2x} .