求极限lim _(xarrow 0)dfrac (x)(sqrt {1-x)-1}= ()lim _(xarrow 0)dfrac (x)(sqrt {1-x)-1}= ()

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

1 计算下列极限1) lim _(xarrow 0)dfrac (sqrt {1+xsin x)-sqrt (cos x)}(xtan x);1) lim _(

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

(1) lim _(xarrow 0)((1-x))^dfrac (1{x)}; ()

求极限lim _(xarrow {0)^+}dfrac (1-sqrt {cos x)}(x(1-cos sqrt {x))}求极限

3.求下列极限:-|||-(1) lim _(xarrow 0)sqrt ({x)^2-2x+5} ;-|||-(4 lim _(xarrow 0)dfrac

求极限：lim _(xarrow 1)(dfrac (1)(1-x)-dfrac (3)(1-{x)^3})-|||-__ __.求极限：.

lim _(xarrow 0)((1-x))^dfrac (1{2x)}=（ ）.=（）.

lim _(xarrow 0)dfrac (sqrt {x+1)-1}(x)= () ． ．

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