考研数学寒假作业3
第三章 一元函数积分学习题部分(答案在后面)
1.设
?f(x)dx?x?1?C,则f(x)?( ).
x?1(A) 1; (B)
2x(x?1)2; (C) 2(x?1)2; (D) ?x2.设f(x)??1,?0,?x?1,0?x?1,求?f(x)dx.
??2x,x?1,3.求下列不定积分
(1)?(x?1)3x2dx (2)?1?x?x2x(1?x2)dx (4)?tan2xdx (5)?sin2x2 dx 4.求下列不定积分
(1)?2cos2xdx (3)?2xex2dx (5)?tanxdx (7)
?1a2?x2dx(a?0) (9)?dxx(1?2lnx) (11)?sin3xdx (13)
?cos2xdx
?2(x?1)2.
x43)?1?x2dx 6)?1dxsin2xx
2cos22 (2)
?13?2xdx
(4)?x1?x2dx (6)?1a2?x2dx (8)?1x2?a2dx ?e3x (10)xdx
(12)?sin2xcos5xdx (14) ?cos4xdx
( (
(15)cos3xcos2xdx (16)cscxdx
??x?5x3dx (18)?(17)?2dx
2x?6x?131?x1dx (20) (19) ?x(1?x2)?4dx
(arcsinx)21?x2(21)?cotx1?sinxdx 5.求
?a2?x2dx(a?0). 6.求
?dx.
(1?x2)1?x27.求
?dxx2?a2(a?0) .
8.求
?dxx2?a2(a?0) .
9.求下列不定积分
(1)?x2exdx (3)?arccosxdx (5)?exsinxdx xcos4x(7)
?2sin3xdx 10.求?x?2x2?2x?3dx.
11.求?1x(x?1)2dx.
12.求不定积分?x2?2x?1(x?1)(x2?x?1)dx. 13.求不定积分?2x3?2x2?5x?5x4?5x2?4dx. 14.求?1?sinxsinx(1?cosx)dx.
1?x(2)?xlnxdx (4)?xarctanxdx (6)?sec3xdx
8)
?x21?x2arctanxdx
(
15.求
4sinx?3cosx?sinx?2cosxdx.
dx.
1?3x?2dx? (1?3x)x16.求?17.求?18.求不定积分?exdx . 19.
?xex1?exdx.
20.求不定积分21.求函数
0?1x?1dx.
xx?12xcostdt的导数. ?2x22.设f(x)在?0,???内连续且f(x)?0?证明函数F(x)?函数?
1?t2?0tf(t)dt在?0,???内为单调增加x?0f(t)dt3x220x23.求下列极限(1)
?elimcosxx?0dtx2? (2)limx?0x0ln(cost)dtx3 (3)lim?x?0??x0tdt?
t(t?sint)dt24.求下列极限?(1)limn?n??1?1??2221?n2?n??1??n2?n2?
(2)
lim?n??i?1nn2?i2n2
1p?2p??np(p?0) (3)limp?1n??n25.计算
?102x?x2dx.
x?2dx.
2x?1326.计算?027.计算
4?dxx211?x2
28.计算
?134dx 1?x?1