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A:A
B:B
C:C
D:D
<img width="293" height="115" alt="" src="http://file.open.com.cn/ItemDB/126522/6dde9773-9921-415e-979e-b505b70a35f1/2016103016398240.jpg" />
A:A
B:B
C:C
D:D
<img width="544" height="81" alt="" src="http://file.open.com.cn/ItemDB/126522/0d420505-0b10-408a-80b2-3e89d4e7ec66/20161030164022700.jpg" />
A:A
B:B
C:C
D:D
<img width="469" height="117" alt="" src="http://file.open.com.cn/ItemDB/126522/5bc0166c-81dc-427e-8424-61d5d8690cfa/20161030162830176.jpg" />
A:A
B:B
C:C
D:D
要用铁板做一个体积为2m^3的有盖长方体水箱,问长、宽、高各取怎样的尺寸时,才能使用料最省?
A:均为3√2m时，用料最省.
B:均为3√3m时，用料最省.
C:均为√3m时，用料最省.
D:均为√2m时，用料最省.
<img width="428" height="107" alt="" src="http://file.open.com.cn/ItemDB/126522/cb5387f5-80ca-46d9-beea-1f6b6eb4ff2f/20161030162654546.jpg" />
A:A
B:B
C:C
D:D
<img height="98" width="578" alt="" src="http://file.open.com.cn/ItemDB/126522/cc817db7-6621-4099-9f23-481fb75fd38a/2015124113030986.png" />
A:A
B:B
C:C
D:D
M1(2,3,1)到点M2(2,7,4)的距离∣M1M2∣=( ).
A:3
B:4
C:5
D:6
<img width="422" height="96" alt="" src="http://file.open.com.cn/ItemDB/126522/a2e196b5-427e-4b4a-b905-71884391a612/20161030163127832.jpg" />
A:A
B:B
C:C
D:D
点x=0是函数y=x^4的( ).
A:驻点但非极值点
B:拐点
C:驻点且是拐点
D:驻点且是极值点
半径R为的金属圆片,则面积S的微分dS是( )
A:πRdR
B:2πRdR
C:πdR
D:2πdR
曲线y=e^x-e^-x的凹区间是( )
A:(-∞,0)
B:(0,+∞)
C:(-∞,1)
D:(-∞,+∞)
曲线 y=x^3+x-2 在点(1,0)处的切线方程是( )
A:y=2(x-1)
B:y=4(x-1)
C:y=4x-1
D:y=3(x-1)
曲线y=xlnx的平行于直线x-y+1=0的切线方程是( )
A:y=x
B:y=(lnx-1)(x-1)
C:y=x-1
D:y=-(x-1)
下列各微分式正确的是( ).
A:xdx=d(x^2)
B:cos2x=d(sin2x)
C:dx=-d(5-x)
D:d(x^2)=(dx)^2
<img width="442" height="85" alt="" src="http://file.open.com.cn/ItemDB/126522/1e1e1555-e29b-4935-99bd-85a5219c6f58/2016103016380519.jpg" />
A:A
B:B
C:C
D:D
<img width="349" height="113" alt="" src="http://file.open.com.cn/ItemDB/126522/99b2b4b4-3ec4-44ee-aa89-2f8319a6131f/20161030163015431.jpg" />
A:A
B:B
C:C
D:D
<img width="346" height="124" alt="" src="http://file.open.com.cn/ItemDB/126522/de2af0ea-04e3-498e-8b75-b60dfa8788a7/2016103016268587.jpg" />
A:A
B:B
C:C
D:D
<img width="357" height="122" alt="" src="http://file.open.com.cn/ItemDB/126522/d975cba9-2d53-446e-a1ea-cc519b21aa84/20161030162956679.jpg" />
A:A
B:B
C:C
D:D
已知y=xsin3x ,则dy=( ).
A:(-cos3x+3sin3x)dx
B:(3xcos3x+sin3x)dx
C:(cos3x+3sin3x)dx
D:(xcos3x+sin3x)dx
<img width="592" height="120" alt="" src="http://file.open.com.cn/ItemDB/126522/f2f4d967-a8d0-4e3b-b080-247587568abd/20161030162926196.jpg" />
A:A
B:B
C:C
D:D
以下结论正确的是( ).
A:若x0为函数y=f(x)的驻点,则x0必为函数y=f(x)的极值点.
B:函数y=f(x)导数不存在的点,一定不是函数y=f(x)的极值点.
C:若函数y=f(x)在x0处取得极值,且f′(x)存在,则必有f′(x)=0.
D:若函数y=f(x)在x0处连续,则y=f′(x0)一定存在.
<img width="424" height="128" alt="" src="http://file.open.com.cn/ItemDB/126522/436f4346-fe25-413b-b9fa-017623c44e3d/20161030164037926.jpg" />
A:A
B:B
C:C
D:D
函数y=ln(1+x^2)在区间[-2,-1]上的最大值为( )
A:4
B:0
C:1
D:ln5
<img height="90" width="450" alt="" src="http://file.open.com.cn/ItemDB/126522/e0757f18-183b-4662-a698-830e93d5b42f/201512411390684.png" />
A:A
B:B
C:C
D:D
<img height="138" width="534" alt="" src="http://file.open.com.cn/ItemDB/126522/2d11d442-79dd-474b-bbce-602d5d7c5a4c/2015124113442854.png" />
A:A
B:B
C:C
D:D
<img width="384" height="73" alt="" src="http://file.open.com.cn/ItemDB/126522/af271522-8b5b-41cb-8182-89a92e90c54f/20161030162757462.jpg" />
A:A
B:B
C:C
D:D
函数y=x^2*e^(-x)及图象在(1,2)内是( ).
A:单调减少且是凸的
B:单调增加且是凸的
C:单调减少且是凹的
D:单调增加且是凹的
<img height="132" width="465" alt="" src="http://file.open.com.cn/ItemDB/126522/7e38ab89-47d5-413f-8044-eced4492362f/2015124113610170.png" />
A:A
B:B
C:C
D:D
<img width="407" height="123" alt="" src="http://file.open.com.cn/ItemDB/20161030163648165.jpg" />
A:A
B:B
C:C
D:D
<img width="461" height="111" alt="" src="http://file.open.com.cn/ItemDB/126522/40ac15a0-f849-4bca-9759-3e66014b7724/2016103016294215.jpg" />
A:A
B:B
C:C
D:D
<img width="402" height="116" alt="" src="http://file.open.com.cn/ItemDB/126522/93feb885-33fb-40b8-8f69-5525954e43bc/2016103016299208.jpg" />
A:A
B:B
C:C
D:D
设函数y=f(x)在点x0处可导，且f′(x)>0, 曲线y=f(x)则在点(x0,f(x0))处的切线的倾斜角为{ }.
A:0
B:π/2
C:锐角
D:钝角
<img height="121" width="502" alt="" src="http://file.open.com.cn/ItemDB/126522/75849dc6-1f77-49f4-9ddc-dfe95f6e54e2/2015124115335435.png" />
A:A
B:B
C:C
D:D
<img width="467" height="97" alt="" src="http://file.open.com.cn/ItemDB/126522/47bec588-9273-4e4e-8c03-1ea0b3488e96/20161030164051998.jpg" />
A:A
B:B
C:C
D:D
<img width="405" height="133" alt="" src="http://file.open.com.cn/ItemDB/126522/37142beb-ba7c-4635-b0aa-60ac956a274b/20161030162528713.jpg" />
A:A
B:B
C:C
D:D
<img width="498" height="131" alt="" src="http://file.open.com.cn/ItemDB/126522/18262cc4-9f0e-45d7-ae97-6bec1b951996/2016103016305835.jpg" />
A:A
B:B
C:C
D:D
<img width="552" height="76" alt="" src="http://file.open.com.cn/ItemDB/126522/f7422511-2000-40df-b69f-99f1d443e475/20161030163825401.jpg" />
A:A
B:B
C:C
D:D
<img height="104" width="684" alt="" src="http://file.open.com.cn/ItemDB/126522/3e13b119-abe2-4578-a5ca-9e50872e6c14/2015124115633873.png" />
A:A
B:B
C:C
D:D
<img width="373" height="72" alt="" src="http://file.open.com.cn/ItemDB/126522/5a1859eb-8be3-41d3-ae58-42e5359920fa/20161030162726293.jpg" />
A:A
B:B
C:C
D:D
<img width="280" height="47" alt="" src="http://file.open.com.cn/ItemDB/126522/c7cdd45c-1561-4cac-9128-bb8435d86025/20161030165249510.jpg" />
A:错误
B:正确
无穷间断点就是函数在该点的极限是无穷。
A:对
B:错
有限个无穷小的和仍然是无穷小.
A:对
B:错
f〞(x)=0对应的点不一定是曲线的拐点
A:对
B:错
<img width="263" height="41" alt="" src="http://file.open.com.cn/ItemDB/126522/bac71c7d-6307-42b9-abd1-faa1131afde5/20161030165234125.jpg" />
A:错误
B:正确
<img width="98" height="64" alt="" src="http://file.open.com.cn/ItemDB/126522/bac71c7d-6307-42b9-abd1-faa1131afde5/20161030165215919.jpg" />
A:错误
B:正确
<img width="164" height="61" alt="" src="http://file.open.com.cn/ItemDB/126522/86d87af1-9eb0-49b0-a62f-ee6b05a9b06d/20161030165318306.jpg" />
A:错误
B:正确
<img width="378" height="56" alt="" src="http://file.open.com.cn/ItemDB/2016103016512323.jpg" />
A:错误
B:正确
任何函数都可以求出定积分。
A:对
B:错
对于函数f(x),若f′(x0)=0,则x0是极值点.
A:对
B:错
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发表于 2020-8-8 19:08:05
