我
- 6
-
- 7
-
已知随机变量ξ的分布列是：
ξ
0
1
2
3
4
5
P
0.1
0.2
0.3L
0.2L
0.1L
0.1L
则Eξ=__________．
- A.ab>2b
- B.2a≥a
- C.<img src="//img1.yqda.net/question-name/e0/f6c99b035c9ae5c1bc218f4d4c453b.jpg" alt=""/>
- D.a2>2a
- 9
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- A.x^2-4x
- B.x^2-4
- C.x^2+4x
- D.x^2
- A.<img src="//img1.yqda.net/question-name/83/6726d4d83da0d7675ed477214eaace.jpg" alt=""/>
- B.<img src="//img1.yqda.net/question-name/25/ca15c7438d02a0499822a812e41e46.jpg" alt=""/>
- C.<img src="//img1.yqda.net/question-name/fd/ae89cc80de846acab4081e11629fcb.jpg" alt=""/>
- D.<img src="//img1.yqda.net/question-name/6d/024fa0e406d5ffdf7b3542bd86d4a9.jpg" alt=""/>
- A.充分条件但不是必要条件
- B.必要条件但不是充分条件
- C.充分必要条件
- D.不是必要条件也不是充分条件
- 13
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- A.<img src="//img1.yqda.net/question-name/4d/f71f377e12b457808c2ee69028f332.jpg" alt=""/>
- B.<img src="//img1.yqda.net/question-name/bf/71aff0e714a4822623a30ce1d513f7.jpg" alt=""/>
- C.<img src="//img1.yqda.net/question-name/62/2567a23108e39ed99a4ab08f1577a7.jpg" alt=""/>
- D.<img src="//img1.yqda.net/question-name/f9/f891904a5073f4ff274f35e57008b7.jpg" alt=""/>
- 14
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- A.<img src="//img1.yqda.net/question-name/51/b211ddb87f7a5511ac4c88f9e21a3d.jpg" alt=""/>
- B.<img src="//img1.yqda.net/question-name/6c/59f37e66d245b9e294842a70a95e0d.jpg" alt=""/>
- C.<img src="//img1.yqda.net/question-name/b0/7e3fd6d271539190ef8ff757ca798c.jpg" alt=""/>
- D.<img src="//img1.yqda.net/question-name/1d/9e3133300ead221964869f200cbdc1.jpg" alt=""/>
- 15
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- A.24
- B.<img src="//img1.yqda.net/question-name/a8/f59c727213e45c170a4441dd67eb55.jpg" alt=""/>
- C.<img src="//img1.yqda.net/question-name/a2/bc14b61aeba070a95cddb3a3aa1bc9.jpg" alt=""/>
- D.6
- A.sin60°
- B.cos60°
- C.cos114°
- D.sin114°
- A.α+b=1
- B.α2+b2=1
- C.ab=1
- D.α=b
- A.第二象限角
- B.第三象限角
- C.第二或第三象限角
- D.第二或第四象限角
- A.x+2y+5=0
- B.2x+y-5=0
- C.2x-Y=0
- D.x+2y-5=0
- A.2x
- B.㏒2 X(X>0)
- C.2X
- D.lg(2x)(X>0)
- A.a=-3
- B.a≥3
- C.a≤-3
- D.a≥-3
- 22
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- A.<img src="//img1.yqda.net/question-name/2d/c87299f5ef2c4cba98dcb7097657af.jpg" alt=""/>
- B.<img src="//img1.yqda.net/question-name/e7/45c1978cb0bdae2faa2ad3f41b3048.jpg" alt=""/>
- C.<img src="//img1.yqda.net/question-name/67/d9c8134678cc8b47e031e7abbce8ae.jpg" alt=""/>
- D.<img src="//img1.yqda.net/question-name/ae/8265267130fdcd96f621ea5603e9bc.jpg" alt=""/>
- 23
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- A.<img src="//img1.yqda.net/question-name/d5/6664e49f2ebf31c11b708aa4599c6b.jpg" alt=""/>
- B.<img src="//img1.yqda.net/question-name/1b/04dc1343088ce43f4553f00d71946f.jpg" alt=""/>
- C.<img src="//img1.yqda.net/question-name/24/65b57b45df3739940d8437e28ed449.jpg" alt=""/>
- D.<img src="//img1.yqda.net/question-name/a3/f73c483cb2d44ab88bf26f59c2e9a1.jpg" alt=""/>
- 24
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- A.p/4
- B.p/2
- C.P
- D.2p
- 25
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（ ）
（ ） - A.{x| 0<x<2}
- B.{x| 0<x<2.5}
- C.{x| 0<x<<img src="//img1.yqda.net/question-name/47/c4b6f147acd5d165775e881fbf062e.png" alt="" />}
- D.{x| 0<x<3}
