(2)int_(-infty)^+infty(dx)/(x^2)+2x+2;

(int )_(-infty )^+infty dfrac (dx)({x)^2+2x+2}..

(2) (int )_(-infty )^+infty dfrac (dx)({x)^2+2x+2}

广义积分int_(1)^+infty(1)/(x^2)dx=（）A. 0B. 1C. -1D. 3

()-|||-(2) (int )_(-infty )^+infty dfrac (2x)(1+{x)^2}dx=lim _(aarrow +infty )(i

(int )_(-infty )^+infty (x)^2(e)^-a(x^2)dx=dfrac (1)(2)sqrt (dfrac {pi )({a)^3}}

11.设int_(1)^+infty(a)/(x(2x+a))dx=ln2，则a=____.11.设$\int_{1}^{+\infty}\frac{a}{x(

(int )_(0)^+infty x(2)^-xdx=( )(int )_(0)^+infty x(2)^-xdx=( )(int )_(0)^+inft

(int )_(e)^+infty dfrac (dx)(x{ln )^2x}= __

[题目]-|||-(int )_(2)^+infty dfrac (dx)((x+7)sqrt {x-2)}= __

计算(int )_(0)^+infty dfrac (dx)({x)^2+4x+3}的值是A (int )_(0)^+infty dfrac (dx)({x)^