篇一:2014电大《经济数学基础》形成性考核册答案
2014电大《经济数学基础》形成性考核册答案
【经济数学基础】形成性考核册(一)
一、填空题 1.lim
x?0
x?sinx
?___________________.答案:0 x
?x2?1,x?0
2.设f(x)??,在x?0处连续,则k?________.答案1
?k,x?0?
3.曲线y?
x+1在(1,1)的切线方程是. 答案:y=1/2X+3/2
2
__.答案2x 4.设函数f(x?1)?x?2x?5,则f?(x)?__________
5.设f(x)?xsinx,则f??()?__________.答案: ?
二、单项选择题
1. 当x???时,下列变量为无穷小量的是( D )
π2
?
2
?2sinxx2
A.ln(1?x)B.C.ex D.
xx?1
1
2. 下列极限计算正确的是( B ) A.lim
x?0
xx
?1 B.lim?
x?0
xx
?1 C.limxsin
x?0
1sinx
?1 D.lim?1
x??xx
3. 设y?lg2x,则dy?( B ). A.
11ln101
dx B.dx C.dx D.dx 2xxln10xx
4. 若函数f (x)在点x0处可导,则( B )是错误的.
A.函数f (x)在点x0处有定义B.limf(x)?A,但A?f(x0)
x?x0
C.函数f (x)在点x0处连续 D.函数f (x)在点x0处可微 5.若f()?x,则f?(x)?( B ). A.
1x
1111
??B.C. D.
xxx2x2
三、解答题 1.计算极限
x2?3x?2
(1)lim 2x?1x?1
解:原式=lim
x?21?21(x?1)(x?2)
?? =lim=
x?1x?1x?1(x?1)(x?1)1?12
x2?5x?6
(2)lim2
x?2x?6x?8
解:原式=lim
x?32?31(x?2)(x?3)
?? =lim
x?2x?4x?2(x?2)(x?4)2?42
(3)lim
x?0
?x?1
x
解:原式=lim
x?0
(?x?1)(?x?1)
x(?x?1)
=lim
x?0
1?x?1x(?x?1)
=lim?
x?0
1?x?1
=?
1 2
2x2?3x?5
(4)lim2。
x??3x?2x?4
352??2
?2?0?0?2 解:原式=lim
x??3??23?0?03xx
sin3x
(5)lim
x?0sin5x
sin3xsin3x
lim
33x?0313
解:原式=lim??????
x?0sin5xsin5x51555
limx?05x5x
x2?4
(6)lim
x?2sin(x?2)
解:原式=lim
(x?2)(x?2)x?2
?lim(x?2)?lim?4?1?4
x?2x?2x?2sin(x?2)sin(x?2)
1?
xsin?b,x?0?x?
a,x?0, 2.设函数f(x)??
?sinx
x?0?x?
问:(1)当a,b为何值时,f(x)在x?0处极限存在? (2)当a,b为何值时,f(x)在x?0处连续. 解:(1)因为f(x)在x?0处有极限存在,则有
xlim?0?
f(x)?xlim?0
?
f(x) 又 f(x)?lim(xsi1
xl?i0
m?x?0
?
x
?b)?b limf(x)?lisinx
x?0
?x?0
?
x
?1 即 b?1
所以当a为实数、b?1时,f(x)在x?0处极限存在. (2)因为f(x)在x?0处连续,则有
xl?i0
m?f(x)?xl?i0
m?
f(x)?f(0) 又f(0)?a,结合(1)可知a?b?1 所以当a?b?1时,f(x)在x?0处连续. 3.计算下列函数的导数或微分: (1)y?x2?2x?log2x?22,求y? 解:y??2x?2x
ln2?1
xln2
(2)y?ax?b
cx?d
,求y?
解:y??
(ax?b)?(cx?d)?(ax?b)(cx?d)?a(cx?d)?(ax?b)c(cx?d)2=ad?bc
(cx?d)2 =(cx?d)
2
(3)y?
13x?5
,求y?
1
13
解:y??[(3x?5)?
2
]???1?2?12(3x?5)(3x?5)???32
(3x?5)?2 (4)y?
x?xex,求y?
11
解:y??(x2
)??(xex
)??12
x?2?ex?xex
。
(5)y?eax
sinbx,求dy 解
y??(eax)?sbx?eax(
bx)??eax(ax)?sbx?eaxcbx(bx)?
aeaxsinbx?beaxcosbx
=
:
is
dy?y?dx?(aeaxsinbx?beaxcosbx)dx
1(6)y?ex
?xx,求dy
11
313x
1
解:y??(ex)??(x2)??ex(13
2
?1x)??2x
??ex
?32x22
1x
1
dy?y?dx?(?e3
x
2?2x2)dx
(7)y?cosx?e?x2
,求dy 解:y??(cosx)??(e?x2
)???sinx(x)??e?x2
(?x2)???
sinx?x2
2x
?2xe
(8)y?sinnx?sinnx,求y? 解
y??[x)n]??(nx)??n(x)n?1(x)??cnx(nx)??n(sinx)n?1cosx?ncosnx
(9)y?ln(x??x2),求y? 1解:y??
1x??x
2
(x??x2
)??
1(1((1x??x
2
??x2
)2
)?)
=1
11
?11xx??x2(1?2(1?x)?2x)???x222
1x??x2??x2??x
2(10)y?2
cot
1x
?
1?x2?2x
x
,求y?
35
(2
sin
1x
)??(x?111解:y??2
)??(x6
)??(2)??2
sin
x
ln2(sin11?1?
x)??2x2?6
x6?0
si1
i?3?1
?5x
5
?2
s1x
ln2(1112
6
cosx)(x)??2x
6
x?2ln21?31?x2cosx?2x2?6
x6 4.下列各方程中y是x的隐函数,试求y?或dy (1)x2
?y2
?xy?3x?1,求dy 解:方程两边同时对x求导得:
:
(s
(x2)??(y2)??(xy)??(3x)??(1)? 2x?2yy??y?xy??3?0 y??
y?2x?3
2y?x
2y?x
dy?y?dx?y?2x?3dx (2)sin(x?y)?exy?4x,求y? 解:方程两边同时对x求导得:
cosx(?y)?(x?y)??exy?(xy)??4 cosx(?y)?(1?y?)?exy?(y?xy?)?4 y?(cos(x?y)?xexy)?4?cos(x?y)?yexy
4?cos(x?y)?yexy
y??xy
cos(x?y)?xe
5.求下列函数的二阶导数: (1)y?ln(1?x2),求y?? 解:y??
12x2
?(1?x)? 22
1?x1?x
2x2(1?x2)?2x(0?2x)2?2x2
y???( )???22222
1?x(1?x)(1?x)
(2)y?
1?xx
,求y??及y??(1)
?1?x1?1?
解:y??()??(x2)??(x2)???x2?x2
22x
1131
1?1?13?11?3?1?
y???(?x2?x2)????(?x2)??(?)x2?x2?x2=1
22222244
315353
《经济数学基础》形成性考核册(二)
(一)填空题 1.若2.
?
f(x)dx?2x?2x?c,则f(x)?2xln2?2.
?(sinx)?dx
篇二:2015电大最新经济数学基础12形成性考核册答案(带题目)
经济数学基础形成性考核册参考答案
部分题目与答案符号在预览界面看不清,下载后再打开就可以看清了 作业一
(一)填空题 1.lim
x?0
x?sinx
?___________________.答案:0 x
?x2?1,x?0
2.设f(x)??,在x?0处连续,则k?________.答案:1
?k,x?0?
3.曲线y?
x+1在(1,2)的切线方程是答案:y?
11
x? 22
__.答案:2x 4.设函数f(x?1)?x2?2x?5,则f?(x)?__________
5.设f(x)?xsinx,则f??()?__________.答案:?
π
2π 2
(二)单项选择题
1. 当x???时,下列变量为无穷小量的是( )答案:D
x2
A.ln(1?x) B.
x?1
C.e
?1x2
D.
sinx
x
2. 下列极限计算正确的是()答案:B A.lim
x?0
xx
?1B.lim?
x?0
xx
?1
C.limxsin
x?0
1sinx
?1 D.lim?1
x??xx
3. 设y?lg2x,则dy?().答案:B A.
11ln101
dx B.dx C.dx D.dx 2xxln10xx
4. 若函数f (x)在点x0处可导,则( )是错误的.答案:B
A.函数f (x)在点x0处有定义B.limf(x)?A,但A?f(x0)
x?x0
C.函数f (x)在点x0处连续 D.函数f (x)在点x0处可微 5.若f()?x,f?(x)?( ). 答案:B
1x
A.
1111
??B.C. D.
xx2x2x
(三)解答题
1.计算极限
x2?3x?21x2?5x?61
?? (2)lim2? (1)lim2x?1x?22x?1x?6x?822x2?3x?51?x?11
? (3)lim??(4)lim2
x??x?0x23x?2x?43sin3x3x2?4
? (6)lim(5)lim?4
x?0sin5xx?2sin(x?2)5
1?
xsin?b,x?0?x?
2.设函数f(x)??a,x?0,
?sinx
x?0?x?
问:(1)当a,b为何值时,f(x)在x?0处有极限存在? (2)当a,b为何值时,f(x)在x?0处连续.
答案:(1)当b?1,a任意时,f(x)在x?0处有极限存在; (2)当a?b?1时,f(x)在x?0处连续。 3.计算下列函数的导数或微分: (1)y?x?2?log2x?2,求y? 答案:y??2x?2ln2?(2)y?
x
2x2
1 xln2
ax?b
,求y?
cx?d
答案:y??
ad?cb
2
(cx?d)13x?5
,求y?
(3)y?
答案:y??
?32(3x?5)
3
(4)y?
x?xex,求y?
答案:y??
12x
?(x?1)ex
(5)y?eaxsinbx,求dy
答案:dy?eax(asinbx?bcosbx)dx (6)y?e?xx,求dy
1x
11
2ex)dx 答案:dy
?x
(7)y?cosx?e?x,求dy 答案:dy?(2xe?x?
2
2
sinx2x
)dx
(8)y?sinnx?sinnx,求y? 答案:y??n(sinn?1xcosx?cosnx) (9)y?ln(x??x2),求y? 答案:y??
1?x
sin1
x
2
(10
)y?2
y? ?
1x
答案:y???
2
sin
ln2
x2
5?11?31
cos?x2?x6
x26
4.下列各方程中y是x的隐函数,试求y?或dy (1)x?y?xy?3x?1,求dy 答案:dy?
2
2
y?3?2xdx
2y?x
xy
(2)sin(x?y)?e?4x,求y?
4?yexy?cos(x?y)
答案:y?? xy
xe?cos(x?y)
5.求下列函数的二阶导数: (1)y?ln(1?x2),求y??
2?2x2答案:y??? 22
(1?x)
(2)y?
1?xx
,求y??及y??(1)
3?21?2
答案:y???x?x,y??(1)?1
44
电算化会计、职业技能实训(一)需要代考的同学请联系QQ:499086608(保证过关)
53
作业2
一、填空题
1、若∫f(x)dx=2x+2x+c ,则x2、∫(sinx)'
3、若∫f(x)dx=F(x)+c,则∫xf(1-x22de2ln(x?1)dx?0. 4、 ?1dx
5、若P?
x??
?
x
dt,二、单项选择题
1、下列函数中,( D )是xsinx2的原函数
A. 0.5cosx2 B. 2cosx2 C. –2cosx2D.-0.5cosx2
2、下列等式成立的是( C)
1?
A. sinx dx=d(cosx) B. lnxdx=d???
?x?
C. 2x dx = d(2x) /ln2
D.
?d 3、下列不定积分中,常用分部积分的是( C)A. ∫cos(2x+1)dx B.
? C. ∫xsin2x dxD. ∫x/(1+x2) dx 4、下列定积分正确的是( D ) A. C.
5、下列无穷积分收敛的是(B ). A.C.
三、解答题
1、 求下列不定积分
?3?x??x
3e?3?
(1) ?xdx????dx????c。
3e?e?lne
x
?
?
?
1
?1
2xdx?2 B.
?
16
?1
dx?15
?
??cosxdx?0 D. ??sinxdx?0
?
?
??
1
1
dx B. x
x
?
??
1
1dx 2x
?
??
edxD.
?
??
sinxdx
篇三:电大2015年最新超全 中央电大经济数学基础形成性考核册及参考答案
电大2015年最新超全 中央电大经济数学基础形成性考核册及参考答案
电大2015年最新超全 中央电大经济数学基础形成性考核册及参考答案
电大2015年最新超全 中央电大经济数学基础形成性考核册及参考答案
电大2015年最新超全 中央电大经济数学基础形成性考核册及参考答案
电大2015年最新超全 中央电大经济数学基础形成性考核册及参考答案
作业(一)
(一)填空题 1.limx?0x?sinx?___________________.答案:0 x
?x2?1,x?02.设f(x)??,在x?0处连续,则k?________.答案:1 ?k,x?0?
3.曲线y?x在(1,1)的切线方程是.答案:y?11x? 22
__.答案:2x 4.设函数f(x?1)?x2?2x?5,则f?(x)?__________
5.设f(x)?xsinx,则f??()?__________.答案:?
(二)单项选择题
1. 函数y?π2π 2x?1的连续区间是( )答案:D 2x?x?2
A.(??,1)?(1,??) B.(??,?2)?(?2,??)
C.(??,?2)?(?2,1)?(1,??) D.(??,?2)?(?2,??)或(??,1)?(1,??)
2. 下列极限计算正确的是()答案:B A.limx?0xx?1B.lim?x?0xx?1 C.limxsinx?01sinx?1 D.lim?1 x??xx
3. 设y?lg2x,则dy?().答案:B
A.11ln101dx B.dx C.dx D.dx 2xxln10xx
4. 若函数f (x)在点x0处可导,则( )是错误的.答案:B
A.函数f (x)在点x0处有定义B.limf(x)?A,但A?f(x0) x?x0
C.函数f (x)在点x0处连续 D.函数f (x)在点x0处可微
5.当x?0时,下列变量是无穷小量的是( ). 答案:C
A.2B.xsinx1?x) D.cosx C.ln(x
(三)解答题
1.计算极限
x2?3x?21(x?2)(x?1)x?2(1)lim = = ??limlim2x?1x?1x?12x?1(x?1)(x?1)(x?1)
x2?5x?61(x?2)(x?3)x?3(2)lim2=lim = lim = x?2x?6x?8x?2(x?2)(x?4)x?2(x?4)2
(3)limx?0(?x?1)(?x?1)?x?1=lim x?0xx(?x?1)
=limx?0?x?11=lim?? 2x(?x?1)x?0(?x?1)
1?35?2x2?3x?5?1 lim(4)lim?x??x??3x2?2x?42433??2xx
(5)limsin3x5xsin3x33?lim= x?0sin5xx?03xsin5x55
x2?4(x?2)(x?2)(6)lim?lim?4 x?2sin(x?2)x?2sin(x?2)
1?xsin?b,x?0?x?a,x?0, 2.设函数f(x)???sinxx?0?x?
问:(1)当a,b为何值时,f(x)在x?0处有极限存在?
(2)当a,b为何值时,f(x)在x?0处连续.
答案:(1)当b?1,a任意时,f(x)在x?0处有极限存在;
(2)当a?b?1时,f(x)在x?0处连续。
3.计算下列函数的导数或微分:
(1)y?x?2?log2x?2,求y? 答案:y??2x?2ln2?x2x21 xln2
《2016年秋电大经济数学基础形成性考核册作业四》出自:百味书屋
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