我
的切线，求该切线与抛物线
及x轴所围平面图形绕x轴旋转而成的旋转体体积y.
无解：(2)有解，并求全部解.- 4
-
计算定积分
- 5
-
- 6
-
- 7
-
- 8
-
- 9
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- 10
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- 12
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- 13
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的上凸区间是__________- 15
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处的切线方程是y=__________
中元素a的代数余子式A11等于- A.一1
- B.1
- C.一a
- D.a
：__________- A.若A，B均可逆，则A+B可逆
- B.若A，B均可逆，则AB可逆
- C.若A+B可逆，则A—B可逆
- D.若A+B可逆，则A，B均可逆
- A.<img src="//img1.yqda.net/question-name/0e/1da28ad00d42cc821050ec215334be.png" width="150" height="46"/>
- B.<img src="//img1.yqda.net/question-name/64/7cbf7bd3638f55fc9fa6c3d06445fe.png" width="154" height="42"/>
- C.<img src="//img1.yqda.net/question-name/a1/32873126e32a83b092911086b6b088.png" width="167" height="42"/>
- D.<img src="//img1.yqda.net/question-name/50/74940d105959523615e51bf7270e16.png" width="155" height="50"/>
- A.<img src="//img1.yqda.net/question-name/0e/38177147593520183b56e61ad415d1.png" width="51" height="42"/>
- B.2cosx<sup>2</sup>
- C.-2cosx<sup>2</sup>
- D.<img src="//img1.yqda.net/question-name/f0/a1f6c29d0ea6be1e20c4da6a0bc05a.png" width="59" height="41"/>
- 23
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设f(x)=ex,则
- A.e
- B.2e
- C.<img src="//img1.yqda.net/question-name/8f/2511138b1711d742f6e64d6bf9c9fe.png" width="26" height="49"/>
- D.<img src="//img1.yqda.net/question-name/8d/96927495a5a094db6b60db0a746b50.png" width="28" height="51"/>
- A.1
- B.3
- C.-1
- D.-3
则f(x)在此区间内是- A.单调减少且是上凸的
- B.单调减少且是下凸的
- C.单调增加且是上凸的
- D.单调增加且是下凸的
- A.<img src="//img1.yqda.net/question-name/55/e0920d44a1be7af65ed3fdca82eca7.png" width="35" height="41"/>
- B.<img src="//img1.yqda.net/question-name/31/28f9f24772b303e12edbdb6661de76.png" width="17" height="42"/>
- C.<img src="//img1.yqda.net/question-name/c4/eb07e779b67ec96797ace91d88326b.png" width="49" height="41"/>
- D.ln(x+2)
- 27
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下列极限计算不正确的是
- A.<img src="//img1.yqda.net/question-name/ea/7dbbcf511f42cb79e9b572ec2854e0.png" width="107" height="47"/>
- B.<img src="//img1.yqda.net/question-name/8f/3b50eb5073dd00fdf140509b1e3f5c.png" width="115" height="36"/>
- C.<img src="//img1.yqda.net/question-name/2a/239eda5434ba902ca45109e6f57f92.png" width="108" height="45"/>
- D.<img src="//img1.yqda.net/question-name/37/c2ffdeb2312c2e60ef2993fbb495a7.png" width="105" height="44"/>
- 28
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下列关系式错误的是
- A.<img src="//img1.yqda.net/question-name/e1/6ee878e9c178eeba386f6ddfd76589.png"/>
- B.<img src="//img1.yqda.net/question-name/61/9165608fcb8b8c582473bb40653cb7.png" width="94" height="26"/>
- C.<img src="//img1.yqda.net/question-name/1b/fc70d3e0d54353e59d5580f386bef6.png" width="69" height="27"/>
- D.<img src="//img1.yqda.net/question-name/e4/427020b314c9788e35785e05065855.png" width="69" height="20"/>
与平面2x-y+3z=5的关系是- A.相交但不垂直
- B.重合
- C.相交且垂直
- D.平行
- A.(-2，3，-1)
- B.(-2，-3，-1)
- C.(2, -3，-1)
- D.(-2,-3，1)
