我
- 2
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- 12
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- 15
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椭圆
的焦点坐标是( )
的焦点坐标是( )- A.(<img src="//img1.yqda.net/question-name/5e/2e3359046bf54f2161949c00946607.png" width="30" height="20"/>,0)
- B.(±7,0)
- C.(0,±7)
- D.(0,<img src="//img1.yqda.net/question-name/9b/51555ff73b10fbfb39b007255f3b94.png" width="30" height="20"/>)
- A.{x|0< x<1}
- B.{x|x>0}
- C.{x|-2< x<1}
- D.{x|x>-2}
- A.1/5
- B.1/4
- C.1/3
- D.1/2
- A.-1
- B.1
- C.0
- D.<img src="//img1.yqda.net/question-name/e0/39dcbe0332a6fdbb85037a653b09c1.png" width="20" height="25"/>
- A.y= -1/8
- B.y= -1/4
- C.y= -1/2
- D.y= -1
- 20
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- A.(5, 10)
- B.(-5, -10)
- C.(10, 5)
- D.(-10, -5)
- A.<img src="//img1.yqda.net/question-name/39/8f952b8ae17287755c79c35b8d139f.png" width="30" height="30"/>
- B.<img src="//img1.yqda.net/question-name/f0/c1690ee52669980ee6b86f2bdba484.png" width="30" height="30"/>
- C.<img src="//img1.yqda.net/question-name/98/3d21dee1faa3c36908a26edebadfb8.png" width="40" height="40"/>
- D.<img src="//img1.yqda.net/question-name/6f/d4d99a51d5843896dc722209b2158a.png" width="40" height="40"/>
- A.165
- B.160
- C.155
- D.150
- 23
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- A.3/5
- B.-3/5
- C.4/5
- D.-4/5
- 24
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函数
的定义域( )
的定义域( )- A.(3,6)
- B.[-9,1]
- C.(-∞,3]∪[6，+∞)
- D.(-∞，+∞)
