3.已知 '(x)=(e)^-x ,且 f(0)=0 ,则 int f(-x)dx= ( ).()-|||-

3.已知 (int )_(0)^2f(x)dx=3 ,则 (int )_(0)^2[ f(x)+6] dx= __ 一

已知 (x)cdot (int )_(0)^2f(x)dx=8, 且 (0)=0, (x)geqslant 0, 则 f(x)= __

2.设 (x)=2, 且 f(0)=0 ,则 int f(x)dx= __-|||-

3.已知 (2x)=x(e)^x, 则 (int )_(-1)^1|f(x)|dx= __

已知 f(x)在 [1, 4] 可导, f(4)= 1, int_(0)^4 xf(x), dx = 3，则 int_(0)^4 f(x), dx = (

3.[单选题]已知f(x)是连续的偶函数且-|||-(int )_(0)^3f(x)dx=2 ,则 (int )_(-3)^3f(x)dx= ()-|||-A

设 (x)=(e)^-x, 则 int dfrac (f(ln x))(x)dx= .(x)=(e)^-x, 则 int dfrac (f(ln x))(x)

设 f ( x ) 是连续奇函数且(int )_(0)^1f(x)dx=-2 则 (int )_(0)^1f(x)dx=-2设f(x)是连续奇函数且则

(4)已知 (x)=(int )_(1)^x(e)^-(t^2)dt, 则 (int )_(0)^1f(x)dx=

[题目]已知 (x)=(x)^2+(int )_(0)^2f(x)dx, 则∫f-|||-(x) = __ .