高等数学试题库(5)

2019-03-09 13:57

3、设某产品的需求量q为价格p的函数,且q?1000e?0.5p,则需求对价格的弹性为 .

4、过点(1,3)且切线斜率为2x的曲线方程是y= .

?x25、函数y?e的拐点为

的单调递增区间为___________,最大值为__________

6、函数y?e?x27、函数y?xe?x 的驻点是 ,拐点是

8、设函数f?x?在点x0处具有导数,且在x0处取得极值,则该函数在x0处的导数

f??x0?? 。

(五)不定积分

?x1、已知f(x)的一个原函数为e,则f(x)= .

2、若f?(x)存在且连续,则[?df(x)]?? . 3、若?f(x)dx?F(x)?c,则?e?xf(e?x)dx= . 4、若f(x)连续,则(?f(x)dx)?= . 5、设f(x)?cosx,则f[(1?x)x2?x0f(t)dt]?_______________;

6、?dx? .

7、?cscx(cscx?ctgx)dx? . x8、?f(x)dx?3e3?C,则f(x)? . 9、?cos2xcosx?sinxcosxdx= .

10、?esinxdx= .

11、?arctan21xdx? . 12、?(tgx?tgx)dx? . 13、?14、?2?x1?x42dx? .

110?6x?x2dx? .

x215、若xf(x)dx?sine??C,则f(x)?

16、?1?xlnx?xx2dx?

(六)定积分及应用

1、已知f(x)在(??,??)上连续,且f(0)?2,且设F(x)?F?(0)? . ?x2sinxf(t)dt,则

?e2x?x?1,?3x2、设f(x)???xsint2dt?x?3,??0x?0,则limf(x)? . x?0x?03、已知f(2x)?xex,则?4、?5、??a?a1?1f(x)dx? . x[f(x)?f(?x)]dx? . ??2dxx(lnx)k,其中k为常数,当k?1时,这积分 ,当k?1时,这积

分 ,当这积分收敛时,其值为 .

6、设f(x)连续,且f(x)?x?2?f(t)dt则具体的f(x)? . 01

7、设f(x)连续,且?8、limx03f(t)dt?x,则f(8)? . n???10xn1?xxdx? .

9、limx?0?01sintdtx32?

10、

??1(1?x)sinxdx?

23511、???31x2cos1xdx?

2?12、设f(2)?4,?02f(x)dx?1,则?xf?(x)dx?

0

二、求极限

(一)利用极限的四则运算法则求下列函数的极限 (1)lim?2x?3x?4? (2)lim2x?122x?13x?6x?5x?9x?3x222x?22 (3)limx?4x?32x?3

(4)limx?3x?2x?1322x?1 (5)limx?9 (6)limx?1?2x?3x?3

(7)lim4x?2x?4xx?2xx?2x?33x?4x?63x?x?310x?02 (8)limx?0 (9)lim1?2x?3x?231?1?x3x?4

2(10)limx??2 (11)lim3x?5x?1x?7x2x?? (12)lim1?2x1?x3x??

20lim(13)

x??2 (14) limn??1?2?3???(n?1)n2lim (15)

(x10?2)(3x?1)(2x?3)30x??

(16)lim(x?2)(2x?3)(1?3x)3020x?? (17)limn???n?1?1??2?n (18)lim?2?

x?1x?1x?1???(19)limn???n?1?2n?1 (20)lim2?1?(?1)nnn??

(21)lim11?22n???12?3???1n?(n?1)

(22)limx?12x?x?12x?1x?x232x?1 (23)lim10x1?x2x?? (24)lim3n?n?22n?n?5t22n??

(25)limx?? (26)lim2x?1?3x?422x?4 (27)limt??2e?1t

(28)limsin2x2cos(??x)33x??/4 (29)lim(x?x?x???x?x)

(30) lim?x?1??1?x??? 1?x?1

(二)利用第一重要极限公式求下列极限 (1)limtgx?sinxx1?cosxx2x?0 (2)limsin3xsin5xx?0 (3)limx?2sinxx?sinxx?0

(4)limx?0 (5)limarcsinxxx?0 (6)limsinx?1x?11?cosxxsinx?2x?1?

(7)limtgxxx?0 (8)limsinkxxx?0 (9)lim2x?0

(10)limsinx?sinax?asin(x?1)x?1 (11)lim1?x?1x?ax?0xsinx1?x2 (12)limsin(x?1)x?12x?1

(13)limx?1 (14)lim?1x?0xsinx2 (15)limxctg2x

x?0(16)limsin2xtg3xnx?0 (17)limxsinx??2x2 (18)limsinxx??x??

(19)lim2sinn??x2n

(三)利用第二重要极限公式求下列极限

1??(1)lim?1??x??x??3x2?? (2)lim?1??x??x???x2?? (3)lim?1??

x??x???x? (6)lim??

x??1?x??x?1xx2(4)lim?1?xx?02?1x?2?x?x (5)lim??x?02???11??(7)lim?1?3x?x (8)lim?1??x?0x??x??12x3?? (9)lim?1??x??x??

(10)lim?1?2x?x (11)limx?01xln(1?x) (12)lim(x??22x?32x?1x)x?1

x?0(13)lim(1?3tanx)x?02cotx (14)lim(cosx)x?01/x (15)lim(x??x?3x?1)

(16)lim(x?03x?32)x (17)limn(ln(n?2)?lnn)

n???2x?1??x?1?xlim(18))lim? (19)?? (20)lim1?3x ?x??1?xx??2x?1x?0????xx11?xx(21)lim(1?cosx)x?3secx? (22)lim(1?2sinx) (23)lim(1?4x)xx?0x?0

2

(四)利用罗必达法则求极限 (1)limx?27x?3e?ex2x?x3x?3 (2) limln?1?x?xx?0 (3)limx?sinxxlnxx23x?0

(4)limx?0 (5)limxe2xx??? (6)limx???

1?? lnx?(7)limx?2x?12x?52x?? (8)limx?tg3x2?tgx (9)lim?x?1?1?x?1x??1?(10)limx?ex?1? (11)lim??x??x?1??5x?4?x?1x?x?2x?3x?222x (12)limx?0e?1xe2x

(13)lim(3?9)x???xx1/x (14)limx?2 (15)lim?e?2x?2x?01?cosx

(16)limsin5xxlnx??2 (18)lim(1?sinx)x

x?01x?0 (17)limx?0?ctgx(19)limxx?0?sinx (20)lim(x?01x?1e?11x) (21) limxmn?amnx?ax?aa?bx

(22) limx?sinxtanx3x?0 (23) lim(x?01xx?e?12x) (24) limx?0ln(1?x)

(25) limx(x?1?x) (26) lim2x??2x?3x?1x?x?x?1323x?1

三、求导数或微分

(一)利用导数的基本运算公式和运算法则求导数 (1)y?x?x?1 (2)y??x?1x?124?1?32?2x?x?2x ?x???(3)y? (4)y?xlnx?sinx?cosx

x?1x2(5)y?3x?2x?5 (6)y?(7)y?x?x3?33?1

?3 (8)y??x?1??x?2?


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