证明下列各题:(3)1+x 1 1 1-|||-1 1-x 1 1-|||-1 1 1+y 1-|||-1 1 1 1-y

2.4 计算下列行列式:-|||-1+x 1 1 1-|||-(3) 1 1-x 1 1-|||-1 1 1+y 1-|||-1 1 1 1-y

设1-|||-√(1+x^2)是1-|||-√(1+x^2)的一个原函数，求1-|||-√(1+x^2).设是的一个原函数，求.

求lim _(xarrow 1)(dfrac (3)(1-{x)^3}-dfrac (1)(1-x))=()lim _(xarrow 1)(dfrac (3)(

求underset(lim)(x→1)（(1)/(1-x)-(3)/(1-(x)^3)）求$\underset{lim}{x→1}$（$\frac{1}{1-x

lim _(xarrow 1)dfrac (1-{x)^3}(1-x)

12.试从(1)/(1+x)=(1-x)+(x^2-x^3)+...(0<1)证明：ln 2=1-(1)/(2)+(1)/(3)-(1)/(4)+....12.

lim _(xarrow 1)(dfrac (1)(1-x)-dfrac (3)(1-{x)^3})-|||-__ __;;

lim _(xarrow 1)(dfrac (1)(1-x)-dfrac (3)(1-{x)^3})=-|||-_______._____.

lim _(xarrow 1)(dfrac (3)(1-{x)^3}-dfrac (1)(1-x))-|||-__。。

设1 -1-|||-x1= 1-|||-1 ,α2= -3-|||-5 ,-|||-3 11 -1-|||-x1= 1-|||-1 ,α2= -3-|||-5