（x^2+2x+1，x^2-1）（）

求极限：lim _(xarrow infty )((dfrac {{x)^2+2}({x)^2+2x+1})}^x求极限：

化简dfrac ({x)^2-1}(2{x)^2-x-1}.化简.

(x)=dfrac ({x)^2-1}((x+1)(x-2))

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

[单选题]（x^2-1，x+1）=（）A . 2x-1B . 2x+1C . x+1D . x-1

1.计算下列极限:-|||-(1) lim _(xarrow -1)dfrac ({x)^2+2x+1}(x-1) ;-|||-(3) lim _(xarrow

题目：lim _(xarrow infty )dfrac ({x)^2-1}(2{x)^2-x-1}=-|||-__题目：

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

求lim _(xarrow infty )dfrac ({x)^2-1}(2{x)^2-x-1}-|||-__;求;

1.微分方程(1-(x)^2)(y)^2dfrac (dy)(dx)+(2(x)^2-1)(y)^3=(x)^3是(1-(x)^2)(y)^2dfrac (dy