5.设 _(1)=(int )_(0)^1xdx , _(2)=(int )_(0)^1sin xdx , _(3)=(int )_(0)^1tan xdx, 则有 () .(2分-|||-(A) _(3)lt (I)_(2)lt (I)_(1) (B) _(1)lt (I)_(2)lt (I)_(3)-|||-(C) _(2)lt (I)_(1)lt (I)_(3) (D) _(2)lt (I)_(3)lt (I)_(1)

定积分(int )_(0)^3(2)^xdx=( ).A.(int )_(0)^3(2)^xdx=B.(int )_(0)^3(2)^xdx=C.(in

[题目]设 _(k)=(int )_(0)^kpi (e)^(x^2)sin xdx(k=1,2,3), 则有 ()-|||-

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

定积分(int )_(-1)^1((x)^2020+1)sin xdx=0.（ ）(int )_(-1)^1((x)^2020+1)sin xdx=0错(in

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

(int )_(0)^1dfrac (1)(2)xdx= A.1B.0C.(int )_(0)^1dfrac (1)(2)xdx=D.2A.1B.0C.D.2

计算(int )_(-1)^1sqrt [3]({x)^2}(sin )^5xdx计算

(int )_(0)^dfrac (pi {4)}(tan )^2xdx=1-dfrac (pi )(4) __-|||-__下列式子或叙述不正确的是A.B.设

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

(2) (int )_(1)^exln xdx;