不定积分的典型例题
例35.
x3(1 x)
2
2
3
2
x tant
1 x2
x2 c.
例36. 例37
x ax4
2
dx
x asecta 0
1 x2 a2
2 x3a
c.
3
dx1 x2
x sint
costcost cos2t dt 2
1 cost1 cost1 x2
arcsinx c.
xx
例38.
()7 2 t
11
ln2 x7 lnx c.142
例39.
dxdx
33 123222
(1 x x)[(x ) ]
24
11
x 2t
dx
x(x7 2)
x
1t
t
(
1)dtt2
tdt2(2x 1)
c.3
3223 x x2(1 t)
4
例40.
x2exx2ex1x 2x2x
dx (xe)dx e c. (x 2)2 x 2x 2x 2例41.
dxx9dx1110
lnx ln(x 2) c. x(2 x10) x10(2 x10)220*例42.
(1 x7)dx(1 x7)x6dx2 lnx ln1 x7 c. x(1 x7) x7(2 x10)7例43.