4)(1)非奇非偶函数
习题
习题1.1
1)(1); (2); (3); (4);,,,,,,,,,,,,1,20,1,,4,,1:,1,1:1,,,,,,0
12);;; 2,1,2
199923);
4)(1)非奇非偶函数;(2)奇函数;(3)偶函数;(4)奇函数;
2,,1,x11,x,1242,2x,x6);;;; 222,x2,x,,1,x
2u2y,u,u,logv,v,1,x7)(1); (2);y,e,u,sinv,v,xa
1,x2y,u,u,arctanv,v,(3); (4);,,y,fu,u,cosv,v,ax,b1,x
1u2,1yuvvmm(5); (6);,,,,y,u,u,1,arcsinx2,,sin,x
习题1.2
03)(1);(2);(3);(4); 11,
31223262x5)(1);(2);(3);(4);(5);(6);(7);2,34422
(8); ,1
1113,akae06)(1);(2);(3);(4)1;(5);(6);(7);(8);eeaa4
,,,,,,limfx,1limfx,,1limfx7) 因为;;所以不存在 x,0,x,0,x,0
8)(1)无穷大量;(2)无穷小量;(3)无穷小量;(4)无穷小量;
AA,ataa10) 因为,所以不会无限增大 limVe(1,e),Ve00t,,,
习题1.3
2)不连续;
b3); a,2
x,,1x,24)(1)第二类间断点(无穷型间断点)和第二类间断点(无穷型间断点);
x,2(2)第一类间断点(可去间断点);
x,0(3)第一类间断点(可去间断点);
x,0(4)第一类间断点(可去间断点);
x,1x,2(5)第一类间断点(可去间断点)和第二类间断点(无穷型间断点)
习题答案 x,0(6)第一类间断点(跳跃间断点)
135)(1);(2)0;(3);(4); cosx02x
习题2.1
,,,,1)(1); (2); (3); (4);,,,,,,,,2fx,fxfxfx0000
,32)(1); (2); 4
4x,y,6,03x,y,6,03) ;
x,04) 在点处不可导 ,,fx
,5) ,,f0,0
习题2.2
2,,y,cosx,xsinx,6x1)(1); (2);y,2xsinx,xcosx 2xx,,(3); (4);y,tanx,xsecx,7y,esinx,ecosx,7sinx,10x
4x215212,,y,(5)y,,,6x; (6); (7);y,3,,2242(1,x)xxx2x 22,x1,x1,2x,,,y,,y,,(8); (9)y,; (10);22222(1,x,x)(2,3x,x)x(1,x) 232,2)(1); y,9x(x,4)
222x(a,x)2222222,(2); y,(a,x)a,x,2xa,x,22a,x
222x1a,,,y,y,(3)y,; (4); (5);243xlnx2233233(a,x)(1,x)(1,x)
ax12,,,y,cotx,1y,(6); (7); (8)y,;222sinxa,xx,1
12,,(9)y,sinxsin(cosx); (10);y,,3sinxcosx,3sin3x
2x
2cos2x62x,3x,,,y,y,,ey,(11); (12); (13);221,x2,1,(sinxcosx)
21111,x,2x,,y,(2,2x)e(14); (15);y,(,,)2x,2x,3x,1 2x2x,(16); y,2esin3x,3ecos3x,x
,kx,kx,kx,kesinx,ecosx,esinx,,,,,y,(17); 2(1,x)
习题答案
22xa22,y,a,x,,(18); 322a,x222(a,x)
1n,1,,y,(19); (20); y,nsinxcos(n,1)x2x1,x
yesinx,y,,y,2x,,,y,y,,3)(1); (2); (3)y,;y,,1,sinx,y2y,x1,xe
1,x111,4)(1); y,x,[,,]1,xx2(1,x)2(1,x)
2x,xx,121121,(2)y,,,,, []22,xx,x,x1,x,x12(1),x,x12(1)
2nxn(x,1,x)21,n,y,n(x,1,x),(1,),(3); 221,x1,x
xcosxcosx1x2lnlnx22,,yxx(4); (5);,(,ln,sin,)yx,,x22x 1xx1ln(1)tan,tanx2x,,yxxx(6); (7);yx,(sec,ln,)(1)[)],,,,2xxx(1)x, sinx,(8); y,a,lna,cosx
dydy2xxf(x)xf(x),,,5)(1); (2);,2x,f,,xef(e)ef(e)ef(x),,dxdx
dy,,,(3); ,,,,,,,,,,,,,fffx,ffx,fxdx
6) ; ,,0,1
x,y,8,07)
dy8) ; ,,cottdx
习题2.3
55,,99220,32,3226,18,0,,,,,,1)(1); (2);3232
213,x,,,,,y,(12x,8x),e2)(1)y,; (2); x
n(n)i2(i)2x(n,i)y,C,(x),(e)(3)提示:利用莱布尼茨公式即可求得;,ni,0
习题答案
n1(n)i(i)(n,i)y,C,x,(4)提示:利用莱布尼茨公式即可求得;(arcsin)(),n2i,0,x1
n1!,,,nn,1n,,nxx,,y1,,3)(1)y,e,2ln2; (2),,;,,nx 222232,,,,,,,,,,,,,4)(1); y,2f(x),4xf(x)y,8xf(x),8xf(x)
11111,3,4,4,5,6,,,,,,,,,,,,,,y,,xf,xfy,xf,xf,xf(2);2()()6()2()()xxxxx ,x,x,2x,x,x,x,2x,x,3x,x,,,,,,,,,,,,,,(3);yef(e)ef(e)yef(e)3ef(e)ef(e),,,,,, ,2,2,3,3,3,,,,,,,,,,,,,,(4);y,,xf(lnx),xf(lnx)y,2xf(lnx),3xf(lnx),xf(lnx)
习题2.4
1112xdyedxdydx,,,,1)(1); (2); (3);dy,2tanxsecxdx22xxx, 21,y111,,dydx,dy,2xsin,cosdx(4); (5); (6);dy,dx,,22,yxxxlnx,, 0.0534e,1.05ln1.01,0.013)(1);(2);(3);(4);1.02,1.006785,3.037
习题3.1
,2)方程有两个实数根,分别和内. ,,,,,,fx,01,22,3
习题3.2
311)(1); (2) ; (3); (4); (5);12cos,,,58
mm,n3(6); (7); (8); (9); (10);111an
11ae(11); (12); (13); (14); (15); (16)11,,22
2)(1)1; (2)1;
习题3.3
2341) . ,56,21(x,4),37(x,4),11(x,4),(x,4)
234561,9x,30x,45x,30x,9x,x2).
2nn,1,(n,2)n,1,3),其中介于与,1,[1,(x,1),(x,1),?,(x,1)],(,1),(x,1)x
之间.
习题答案
2242sectansec,,,,3xx,4), 其中介于与0之间. ,x3
3nxx2n5). x,x,,?,,o(x)2!(n,1)!
6). e,1.645
,5,,531.88,10sin18,0.30902.55,107)(1),误差为; (2),误差为.30,3.10724
118)(1); (2). 32
习题3.4
1)(1)
x ,,,,,,,,,,1,1,33,,,,y — ,,
y? ? ? (2)
11,,,,0, ,1 x ,,,,,,,01,,,,,,,22,,,,,y — — — ,
y? ? ? ?
(3)
11,,,,,,,,1, x ,,,,,,1,,,,22,,,,,y — — ,
y? ? ? (4)
x ,,,,0,nn,,,
,y + —
y? ?
3)(1)
x ,,,,,,,11,,,1
,y — 0 ,y ? ? 极小值 2
(2)
x ,,,,,,,,,,1,1,33,,,3 ,1
,y + — 00 ,
y? 17,47? ? 极大值 极小值
(3)
习题答案
x ,,,,,,,00,,,0
,y — 0 ,
y? ? 极小值0
(4)
x ,,,,,,,2.42.4,,,2.4
,y + — 0
205 y? ? 极大值 10
,2n,,2,,,,x4(5)当时,取得极大值;x,2n,,n,Z2y,ecosxfn,,e,,,,424,,
,当时, ,,x,2n,1,,n,Z,4
5,2n,,2,,,x4取得极小值21 y,ecosx,,fn,,,,e,,,42,,(6)
111,,,, ,,,,ln2 ,ln2,,, x ,ln2,,,,222,,,,
,y — 0 ,
y? ? 极小值 22
(7)
x ,,,,,,,,1,1,,, ,1
,y — 不存在 —
y ? ? 无极值
1,a,24) 时,在处取得极大值; ,,fx,asinx,sin3xx,33
5) (1)最大值,最小值; ,,,,f4,80f,1,,5(2)最大值,最小值; ,,,,f3,11f2,,14
5106) 小屋的两边长为,时,小屋面积最大;
1V7) 当气管半径收缩R时,达到最大; 03
习题3.5
1)(1)
555,,,,,,,,,, x ,,,,33,,,,3
,,y + — 0
习题答案
520,, y, 拐点:: ,,327,,
(2)
x ,,,,,,,22,,, 2
,,y + — 0
2,, y2, 拐点:: ,,2e,,
4x(3)在上是下凹的; ,,y,x,1,e,,,,,,,
(4)
x ,,,,,,,,,,1,1,11,,, ,11 ,,y + — — 0 0
y :拐点:拐点:,,,, ,1,ln2 1,ln2
(5)
111,,,,,,, ,,, x ,,,,222,,,,,,y + — 0
1arctan,,12 ,,y,e拐点 : ,,2,,
(6)
x ,,,,0,11,,,1
,,y + — 0
y拐点 ,,1,,7
93b,3) 当a,,,时; 22
习题4.1
m,n12m53m,x,C1) (1); (2); (3);2x,Cx,x,x,Cm,n53 53122322x,x,x,x,Cx,arctanx,C(4); (5); 353
1xarctanx,3arcsinx,C(6); (7); 2e,lnx,C3
x2,,5,,,3,,sinx,cosx,C(8); (9); 2x,,Cln2,ln3
习题答案
1,2csc2x,C,cotx,tanx,C(10); (11)或;tanx,C2
(12)2arcsinx,Ctanx,secx,C; (13);
y,lnx,12) ;
习题4.2
111) (1); (2); (3);,22,x,C,2cost,Cx,sin2x,C24
2111xx(4); (5); (6);e,C,ln4,3e,C,,C231,tanx
1111223(7); (8); (9);,,Cx,ln,,1,x,C,cosx,cosx,C3xlnx22
31112,3xln,C(10); (11);x,sin2x,sin4x,C122,3x8432
22x,a222lnx,x,a,,Clnx,9,x,C(12); (13);x
2x,1x,C; (15); (14)arcsin,C2223aa,x11(16); ,cos12x,cos2x,C244
2x,2ln,C(17),,; (18); xx,x,2x,2ln1,x,Cx,13
2,xcosx,2xsinx,2cosx,C2)(1); 32xsinx,3xcosx,6xsinx,6cosx,C(2);
2211,x,x2xx,xe,e,Cxlnx,x,C(3); (4); (5);xe,e,C22
1223233lnln(6); xx,xx,x,C3927
22x,,arcsinx,21,xarcsinx,2x,C(7);
2ax1x1e,,abx,bbxsincos32xarctanx,,ln,,1,x,C,C(8); (9);22a,b366 ax333e,,abx,bbxcossin3xxx233xe,6xe,6e,C,C(10); (11);22a,b 2xa2222x,a,lnx,x,a,C(12); 22
习题4.3
习题答案
x1x,11ln,,C1)(1); (2);2arctan,,C2xx,,2x,22
1112(3); (4);lnx,ln,,1,x,Clnx,1,lnx,2,lnx,3,C222 32x,1xarctan,C,x,arctanx,C(5); (6); 232
xx2tan,1tan22322arctan,Carctan,C2)(1); (2);3232
112(3); ,lnsinx,1,lnsinx,1,ln2sinx,1,C623
1113,,,,arctantanx,C(4); (5);,cosx,arctan2cosx,C,,124222,,
1112(6); ,,lntanx,1,arctantanx,lntanx,1,C224
,,31,x122,,2arctan,C3)(1); (2);,,1,x,1,x,C,,32,, 44(3),,; (4),,;,,2x,4x,4lnx,1,Cx,1,4x,1,4lnx,1,1,C
a,x122(5); (6); 2arcsinarccos,Ca,a,x,Cx2a
习题5.1
12R02)(1); (2); (3); 1,4
5,4224,,3,1,xdx,514)(1); (2);,,,,1,sinxdx,2,,,,14 x112,,0,ln1,xdx,ln2(3); (4); 1,edx,e,,00
11112xx2xdx,xdxedx,edx5)(1); (2); ,,,,00001111x,,,,xdx,lnx,1dxedx,ln1,xdx(3); (4);,,,,0000
习题5.2
dy1); ,cottdx
习题答案
cosx,y,,2); ye
x2,t,,3)函数,x,tedt有极小值; ,,,0,0,0
,x2x,,4); ,,,x,,e,4e
5); 2
2a,,213a,,a6)(1); (2); (3); (4);2836
,8(5); (6); (7); (8); 11,,43
习题5.3
4,a,11)(1); (2); (3); (4);4,2ln21626
12(5),,1; (6); (7); (8);23,2223e
00(9); (10);
21e2,18ln2,4,2)(1); (2); (3); (4);1,,44e42 2e131e,,,sin1,cos1,(5); (6); ,,2442e22
,3e,,,2(7),; (8); 564
114); 2
习题5.4
1111)(1); (2)发散; (3); (4);2,ln2
,(5)发散; (6),1; (7)1; (8); 2
2)(1)收敛; (2)收敛; (3)发散; (4)收敛;
n!3)1;2;
习题5.5
3191)(1); (2); (3); ,ln2622
习题答案
225eea,32e,e,,,(4); (5); (6);6368
,433234,2)(1); (2); (3); (4)R;,3210
112a,ae,e6a8a3)(1); (2); (3); (4);27
4a4b,,,2,3e,1138.47426133.334),; 5)千焦; 6)牛顿; 7);,,3,3,,,