求极限 $\lim_{x \to \infty} \left( \frac{2x+3}{2x+1} \right)^{x-1}$
(15)lim_(xtoinfty)((2x+3)/(2x+1))^x+1.(15)$\lim_{x\to\infty}\left(\frac{2x+3}{2x
(3) lim _(xarrow infty )((dfrac {2x+3)(2x+1))}^x+1
(3) lim _(xarrow infty )((dfrac {2x+3)(2x+1))}^x+1;
(3) lim _(xarrow infty )((dfrac {2x+3)(2x+1))}^x+1;
(2) lim _(xarrow infty )((dfrac {2x+3)(2x+1))}^x+1;
求极限lim _(xarrow infty )((dfrac {x)(1+x))}^2x+3求极限
(5) lim _(xarrow infty )((dfrac {2x+3)(2x+1))}^x+1;
已知极限lim_(x to infty) (ax+3)/(x-1) = 2，则(）A. a=0B. a=2C. a=1D. a 为任意常数
求下列极限（3）lim _(xarrow infty )(dfrac ({x)^3}(2{x)^2-1}-dfrac ({x)^2}(2x+1))求下列极限（3
求极限 lim_(x to +infty) (3^x + 9^x)^(1)/(x) 求极限 $\lim_{x \to +\infty} (3^x + 9^x)^