(int )_(0)^a(e)^3xdx=dfrac (1)(3)(e-1), 则a= () 。-|||-

int x(e)^-3xdx;

不定积分 int (e)^2xcos 3xdx=

7.计算下列定积分:-|||-(1) (int )_(0)^1x(e)^-xdx ;-|||-(2)(int )_(1)^xxln xdx;-|||-(3) (

(24 ) int (cos )^3xdx

定积分(int )_(0)^dfrac (pi {2)}(e)^xsin xdx的值是(int )_(0)^dfrac (pi {2)}(e)^xsin xdx

不定积分int (({e)^x+2)}^3(e)^xdx=()A、 int (({e)^x+2)}^3(e)^xdx=()B 、int (({e)^x+2)}^

(int )_(0)^1x(e)^xdx= __

填空:-|||-(1) int (x)^3(e)^xdx= __ ;-|||-(2) int dfrac (x+5)({x)^2-6x+13}dx= __

求方程=dfrac (1)(3)(e)^x根的牛顿迭代格式为=dfrac (1)(3)(e)^x=dfrac (1)(3)(e)^x=dfrac (1)(3)(

[例3] (int )_(0)^+infty dfrac (x{e)^-x}({(1+{e)^-x)}^2}dx