我
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设矩阵Am×n有r(A)
- A.(AB)<sup>-1</sup>=A<sup>-1</sup>·B<sup>-1</sup>
- B.(AB)<sup>-1</sup>=B<sup>-1</sup>·A<sup>-1</sup>
- C.[(AB)<sup>T</sup>]<sup>-1</sup>=[(AB)<sup>-1</sup>]<sup>T</sup>
- D.[(AB)<sup>-1</sup>]<sup>-1</sup>=AB
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- A.0
- B.3
- C.2
- D.1
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- A.2M
- B.4M
- C.-2M
- D.-4M
- A.(-∞,0)
- B.(-∞,+∞)
- C.(0,+∞)
- D.[1,+∞)
- A.(1,-7)
- B.(0,0)
- C.(-1,25)
- D.(2,16)
- A.<img src="//img1.yqda.net/question-name/53/03b7be2b8bef9ce92a3f538f3969d0.png" width="124" height="47"/>
- B.<img src="//img1.yqda.net/question-name/8b/31b6826beabb5464b2a8f34bdf7c34.png" width="107" height="46"/>
- C.sin2x+x+C
- D.-sin2x+x+C
- A.<img src="//img1.yqda.net/question-name/22/613487f4af8b6b3203221274c1b165.png" width="26" height="28"/>
- B.ln(1+x)
- C.1-cosx
- D.<img src="//img1.yqda.net/question-name/49/2b995be494d7ca443159cd78f79f4e.png" width="112" height="29"/>
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- A.f'(0)
- B.-f'(0)
- C.<img src="//img1.yqda.net/question-name/45/826b14fe9852bf06628e915c1dc9eb.png" width="59" height="41"/>
- D.<img src="//img1.yqda.net/question-name/24/b3129554a78e23854611e5838a18b7.png" width="51" height="47"/>
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- A.<img src="//img1.yqda.net/question-name/d9/51a3909e442bec11a8e7eefe390030.png" width="149" height="42"/>
- B.<img src="//img1.yqda.net/question-name/46/4fa2e5e99f61e96d93d530a83251a4.png" width="111" height="31"/>
- C.<img src="//img1.yqda.net/question-name/52/a945bc87582d2013b6ca911380d904.png" width="108" height="30"/>
- D.<img src="//img1.yqda.net/question-name/b8/4f371f8aae9b2aabd23785b7f340d2.png" width="99" height="38"/>
- A.过x轴
- B.过y轴
- C.过z轴
- D.是yz面
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- A.∞
- B.e<sup>2</sup>
- C.0
- D.2
- A.(-3,2,-1)
- B.(-3,-2,1)
- C.(3,-2,1)
- D.(-3,-2,-1)
