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经济数学基础12答案

经济数学基础12答案【篇一:2016年最新电大《经济数学基础12》考试题及答案】s=txt>作业(一)(一)填空题 1.limx?0x?sinx___________________.答案:0 xx21,x02.设f(x)??,在x?0处连续,则k?________.答案:1k,x03.曲线y?x在(1,1)的切线方程是答案:y?11x? 224.设函数f(x?1)?x2?2x?5,则f?(x)?____________.答案:2x5.设f(x)?xsinx,则f??()?__________.答案:?(二)单项选择题 1. 函数y?x?1的连续区间是()答案:d 2x?x?2a.(??,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?0xx1b.limx?0xx1c.limxsinx?01sinx1 d.lim1x??xx3. 设y?lg2x,则dy?().答案:b a.11ln101dx b.dx c.dx d.dx 2xxln10xx4. 若函数f (x)在点x0处可导,则( )是错误的.答案:ba.函数f (x)在点x0处有定义b.limf(x)?a,但a?f(x0)x?x0c.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.(三)解答题1.计算极限xsinx1?x) d.cosx c.ln(xx2?3x?21x2?5x?61(2)lim2? (1)limx?1x?2x?6x?822x2?1x2?3x?51?x?11(3)lim??(4)lim2x??x?0x23x?2x?43sin3x3x2?4(6)lim(5)lim?4x?0sin5xx?25sin(x?2)1?xsin?b,x?0?x?2.设函数f(x)??a,x?0,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?x2?2x?log2x?22,求y? 答案:y??2x?2ln2?(2)y?x1 xln2ax?b,求y?cx?d答案:y??ad?cb2(cx?d)13x?5,求y?(3)y?答案:y??32(3x5)3(4)y?答案:y??x?xex,求y?12xax(x1)ex(5)y?esinbx,求dy答案:dy?e(asinbx?bcosbx)dxax(6)y?e?xx,求dy1x11答案:dy?(x?2ex)dx2x(7)y?cosx?e?x,求dy 答案:dy?(2xe?x?212sinx2x)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?xcot1x2(10)y?2?1x1?x2?2xx3,求y?ln21?21?6xx 答案:y??126x2sinx4.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?222cot5y?3?2xdx2y?xxy(2)sin(x?y)?e?4x,求y?4?yexy?cos(x?y)答案:y?? xyxe?cos(x?y)数的二阶导数:(1)y?ln(1?x),求y??22?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)?14453作业(二)(一)填空题 1.若2.xf(x)dx?2x?2x?c,则f(x)?___________________.答案:2ln2?2 (sinx)dx________.答案:sinx?c ?f(x)dx?f(x)?c,则?xf(1?x2)dx?.答案:?3. 若1f(1?x2)?c 2ln(1?x2)dx?___________.答案:0 4.设函数?dx1 5. 若p(x)?0x1?t2.答案:?t,则p?(x)?__________1?x2(二)单项选择题21. 下列函数中,()是xsinx的原函数. a.11cosx2 b.2cosx2 c.-2cosx2 d.-cosx2 22答案:d2. 下列等式成立的是().a.sinxdx?d(cosx) b.lnxdx?d()c.2dx?x1x1d(2x) ln2d.1xdx?dx答案:c3. 下列不定积分中,常用分部积分法计算的是(). 2a.cos(2x?1)dx, b.x?xdx c.xsin2xdx d.x1x2dx答案:c4. 下列定积分计算正确的是(). a.c.12xdx?2 b.?23161dx?15(xx)dx0 d.?sinxdx?0答案:d5. 下列无穷积分中收敛的是(). a.111xdxb.?dx c.?edx d.?sinxdx 101xx2答案:b(三)解答题1.计算下列不定积分3x(1)?xdxe3xx答案:?cln3e(2)(1?x)2xdx答案:2x?43253x2?5x2?c(3)?x2?4x?2dx 答案:12x22xc (4)?11?2xdx 答案:?12ln?2x?c(5)?x2?x2dx3答案:13(2?x2)2?c(6)sinxxdx答案:?2cosx?c(7)?xsinx2dx答案:?2xcosxx2?4sin2c(8)?ln(x?1)dx答案:(x?1)ln(x?1)?x?c 2.计算下列定积分【篇二:《经济数学基础12》课程形成性考核册及参考答案】class=txt>作业(一)(一)填空题 1.limx?0x?sinx___________________.答案:0 xx21,x02.设f(x)??,在x?0处连续,则k?________.答案:1k,x03.曲线y?x在(1,1)的切线方程是答案:y?11x? 224.设函数f(x?1)?x2?2x?5,则f?(x)?____________.答案:2x5.设f(x)?xsinx,则f??()?__________.答案:?(二)单项选择题 1. 函数y?x?1的连续区间是()答案:d 2x?x?2a.(??,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?0xx1b.limx?0xx1c.limxsinx?01sinx1 d.lim1x??xx3. 设y?lg2x,则dy?().答案:b a.11ln101dx b.dx c.dx d.dx 2xxln10xx4. 若函数f (x)在点x0处可导,则( )是错误的.答案:ba.函数f (x)在点x0处有定义b.limf(x)?a,但a?f(x0)x?x0c.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.(三)解答题1.计算极限xsinx1?x) d.cosx c.ln(xx2?3x?21x2?5x?61(2)lim2? (1)limx?1x?2x?6x?822x2?1x2?3x?51?x?11(3)lim??(4)lim2x??x?0x23x?2x?43sin3x3x2?4(6)lim(5)lim?4x?0sin5xx?25sin(x?2)1?xsin?b,x?0?x?2.设函数f(x)??a,x?0,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?x2?2x?log2x?22,求y? 答案:y??2x?2ln2?(2)y?x1 xln2ax?b,求y?cx?d答案:y??ad?cb2(cx?d)13x?5,求y?(3)y?答案:y??32(3x5)3(4)y?答案:y??x?xex,求y?12xax(x1)ex(5)y?esinbx,求dy答案:dy?e(asinbx?bcosbx)dxax(6)y?e?xx,求dy1x11答案:dy?(x?2ex)dx2x(7)y?cosx?e?x,求dy 答案:dy?(2xe?x?212sinx2x)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?xcot1x2(10)y?2?1x1?x2?2xx3,求y?ln21?21?6xx 答案:y??126x2sinx4.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?222cot5y?3?2xdx2y?xxy(2)sin(x?y)?e?4x,求y?4?yexy?cos(x?y)答案:y?? xyxe?cos(x?y)5.求下列函数的二阶导数:(1)y?ln(1?x),求y??22?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)?14453作业(二)(一)填空题 1.若2.xf(x)dx?2x?2x?c,则f(x)?___________________.答案:2ln2?2 (sinx)dx________.答案:sinx?c ?f(x)dx?f(x)?c,则?xf(1?x2)dx?.答案:?3. 若1f(1?x2)?c 2deln(1?x2)dx?___________.答案:0 4.设函数?dx15. 若p(x)?0x1?t2.答案:?t,则p?(x)?__________1?x2(二)单项选择题21. 下列函数中,()是xsinx的原函数. a.11cosx2 b.2cosx2 c.-2cosx2 d.-cosx2 22答案:d2. 下列等式成立的是().a.sinxdx?d(cosx) b.lnxdx?d()c.2dx?x1x1d(2x) ln2d.1xdx?dx答案:c3. 下列不定积分中,常用分部积分法计算的是(). 2a.cos(2x?1)dx, b.x?xdx c.xsin2xdx d.x1x2dx答案:c4. 下列定积分计算正确的是(). a.c.112xdx?2 b.?23161dx?15(xx)dx0 d.?sinxdx?0答案:d5. 下列无穷积分中收敛的是(). a.111xdxb.?dx c.?edx d.?sinxdx 101xx2答案:b(三)解答题1.计算下列不定积分3x(1)?xdxe3xx答案:?cln3e(2)(1?x)2xdx答案:2x?43253x2?5x2?c(3)?x2?4x?2dx 答案:12x22xc (4)?11?2xdx 答案:?12ln?2x?c(5)?x2?x2dx3答案:13(2?x2)2?c(6)sinxxdx答案:?2cosx?c(7)?xsinx2dx答案:?2xcosxx2?4sin2c(8)?ln(x?1)dx答案:(x?1)ln(x?1)?x?c 2.计算下列定积分【篇三:会计专业1.9.5版经济数学基础12答案】lass=txt>1(对)若数项级数和绝对收敛,则级数必绝对收敛.2(错 )数项级数收敛卖且仅卖对每个稳定的满足条件3(对 )若连续函数列的极限函数正在区间i上不连续,则其函数列正在区间i不一致收敛。

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