Tính tích phân :
I =
1 1 1 1 1
4 2 2 2 2 2 2 2
0 0 0 0 0
1 1 1 1 1
1 ( 1)( 1 2 ( 1) ( 1) 2 1 2 1
xdx xdx dx dx
dx
x x x x x x x x x x x x x x

    

             

    
= I
1
+I
2+ Tính I
1
=
3
11
2
2

u+ Tính I
2
=
3
11
2
2
2
1
22
00
2
13
1
3
()
()
24
2
dx dx dt
xx
x
t



