华中师范大学专用
SK4.4kn¼ê È©
e ؽȩ:
1.
x5+x4 8
=
xdx
xx2
+x+1+x2+x 8 x dx=x3x2
x 3+4 38
2+x+x+1+x 1+
xdxx3x2=3+2+x 4ln|x+1| 3ln|x 1|+8ln|x|+C.2.
1
(x2+1)(xdx
= 2
+x)x+12(x+1)+ 12(x+1)+1
xdx
= 12arctanx 14ln(x2+1) 1
2ln|x+1|+ln|x|+C.
3. 1
x(1+x)(1dx
= +x+x )111 x x+1 x2+x+dx
=ln|x| ln|x+1|
1
1
(x+dx)2
+=ln|x| ln|x+1| 22x+1
arctan+C
20
(0.54)
(0.55)
(0.56)
1.¦