71、根据历年气象统计资料,某地四月份吹东风的概率为9/30,下雨的概率为11/30,既吹东风又下雨的概率为8/30.则在吹东风的条件下下雨的概率为( )
(1.0)
A. 9/11
B. 8/11
C. 2/5
D. 8/9
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1、在矩阵 INCLUDEPICTURE \d "https://p.ananas.chaoxing.com/star3/origin/7716538e2461f2f5b62c9fa4945afa80.png" \* MERGEFORMATINET
变换下,点A( )将会转换成____ INCLUDEPICTURE \d "https://p.ananas.chaoxing.com/star3/origin/47d4e5845baa911d09c667e915fde116.png" \* MERGEFORMATINET
________
( )
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22、向量 INCLUDEPICTURE \d "https://p.ananas.chaoxing.com/star3/origin/73357b760f571c259794ef21e9f7b9ef.png" \* MERGEFORMATINET
先逆时针旋转 INCLUDEPICTURE \d "http://mooc1-api.chaoxing.com/ananas/latex/p/29250" \* MERGEFORMATINET
,再顺时针旋转 INCLUDEPICTURE \d "http://mooc1-api.chaoxing.com/ananas/latex/p/463231" \* MERGEFORMATINET
得到的向量为( )
(1.0)
A. INCLUDEPICTURE \d "https://p.ananas.chaoxing.com/star3/origin/73357b760f571c259794ef21e9f7b9ef.png" \* MERGEFORMATINET
B. INCLUDEPICTURE \d "https://p.ananas.chaoxing.com/star3/origin/6d0b6e9f4255e23716df5adbbacccc7b.png" \* MERGEFORMATINET
C. INCLUDEPICTURE \d "https://p.ananas.chaoxing.com/star3/origin/62e4261dfaa7c90b847194de5d1bc7eb.png" \* MERGEFORMATINET
D. INCLUDEPICTURE \d "https://p.ananas.chaoxing.com/star3/origin/e749a2c6979ee62ee10ddca7dfe12ba9.png" \* MERGEFORMATINET
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52、设三阶方阵A的特征值分别为2,-3,-1,下列各式中不成立的是
(1.0)
A. INCLUDEPICTURE \d "https://p.ananas.chaoxing.com/star3/origin/527a848681db7a61e567cbd9069df5df.png" \* MERGEFORMATINET
B. Ax=-3x
C. Ax=-x
D. Ax=x
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67、被尊称为图论之父的是( )
(1.0)
A. 欧拉
B. 迪克斯特拉
C. 克鲁斯卡尔
D. 普里姆
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20、一个家庭中有两个小孩.假定生男、生女是等可能的,已知这个家庭有一个是女孩,则这时另一个小孩是男孩的概率是________.( )
( )
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7
https://www.shititong.cn/cha-kan/shiti/0005b877-74f3-99f0-c0ce-60519723ce08.html
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8、 INCLUDEPICTURE \d "https://p.ananas.chaoxing.com/star3/origin/1dfc70d071d6369bf916779be9d6bc3c.png" \* MERGEFORMATINET
( )
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5
https://www.shititong.cn/cha-kan/shiti/0005b877-74f3-5f58-c0ce-60519723ce02.html
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18、下列矩阵不可逆的是( )
(1.0)
A. INCLUDEPICTURE \d "https://p.ananas.chaoxing.com/star3/origin/2c79950d28016a72597b4f4f76fa6919.png" \* MERGEFORMATINET
B. INCLUDEPICTURE \d "https://p.ananas.chaoxing.com/star3/origin/8309567273fa234e9387c093ebe78eeb.png" \* MERGEFORMATINET
C. INCLUDEPICTURE \d "https://p.ananas.chaoxing.com/star3/origin/55ac4c0e2b3f16262d05e475cb4a70bd.png" \* MERGEFORMATINET
D. INCLUDEPICTURE \d "https://p.ananas.chaoxing.com/star3/origin/35fc36002121149f45d835d016229bae.png" \* MERGEFORMATINET
https://www.shititong.cn/cha-kan/shiti/0005b877-74f1-3890-c0ce-60519723ce00.html
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