35、下面不是阶梯型矩阵的是( )
(1.0)
A. INCLUDEPICTURE \d "https://p.ananas.chaoxing.com/star3/origin/cbfa63facc47534b5791c0edb3985858.png" \* MERGEFORMATINET
B. INCLUDEPICTURE \d "https://p.ananas.chaoxing.com/star3/origin/f00401a0806543e0c700b626719028d3.png" \* MERGEFORMATINET
C. INCLUDEPICTURE \d "https://p.ananas.chaoxing.com/star3/origin/b68a546fa6a2abd42fdf096156b763f0.png" \* MERGEFORMATINET
D. INCLUDEPICTURE \d "https://p.ananas.chaoxing.com/star3/origin/d7b17fc70b316cb4a0d33d9111f5a0fe.png" \* MERGEFORMATINET
https://www.shititong.cn/cha-kan/shiti/0005b877-74f2-3290-c0ce-60519723ce00.html
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70、设无向简单图的顶点个数为n,则该图最多有( )条边
(1.0)
A. n-1
B. n(n-1)/2
C. n(n+1)/2
D. INCLUDEPICTURE \d "http://mooc1-api.chaoxing.com/ananas/latex/p/576" \* MERGEFORMATINET
https://www.shititong.cn/cha-kan/shiti/0005b877-74f3-3848-c0ce-60519723ce04.html
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4、
https://www.shititong.cn/cha-kan/shiti/0005b877-74f3-6728-c0ce-60519723ce01.html
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79、以A表示事件“甲种产品畅销,乙种产品滞销”,则其对立事件 INCLUDEPICTURE \d "https://p.ananas.chaoxing.com/star3/origin/6c633daab7e33d41142bf6962c6f78b1.png" \* MERGEFORMATINET
为
(1.0)
A. “甲种产品滞销,乙种产品畅销”
B. “甲、乙两种产品均畅销”
C. “甲种产品滞销”
D. “甲种产品滞销或乙种产品畅销”
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3、
已知向量a,b,其中|a|= INCLUDEPICTURE \d "http://mooc1-api.chaoxing.com/ananas/latex/p/1895" \* MERGEFORMATINET
,|b|=2,且( )⊥a,则向量a和b的夹角是________度.
( )
https://www.shititong.cn/cha-kan/shiti/0005b877-74f3-6340-c0ce-60519723ce01.html
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5点,7边
https://www.shititong.cn/cha-kan/shiti/0005b877-74f3-3848-c0ce-60519723ce03.html
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6
https://www.shititong.cn/cha-kan/shiti/0005b877-74f3-6b10-c0ce-60519723ce01.html
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6、一个7×5的矩阵如果各列线性无关,则它的秩=________
( )
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25、将坐标处理成列向量的形式,则绕原点逆时针旋转θ,则旋转矩阵 INCLUDEPICTURE \d "http://p.ananas.chaoxing.com/star3/origin/7306824af62074b8f1c82f4ed362cce4.png" \* MERGEFORMATINET
中的b为( )
(1.0)
A. INCLUDEPICTURE \d "http://mooc1-api.chaoxing.com/ananas/latex/p/66342" \* MERGEFORMATINET
B. INCLUDEPICTURE \d "http://mooc1-api.chaoxing.com/ananas/latex/p/395215" \* MERGEFORMATINET
C. INCLUDEPICTURE \d "http://mooc1-api.chaoxing.com/ananas/latex/p/211233" \* MERGEFORMATINET
D. INCLUDEPICTURE \d "http://mooc1-api.chaoxing.com/ananas/latex/p/415549" \* MERGEFORMATINET
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65、在有n个结点的连通图中,其边数( )
(1.0)
A. 最多有n-1条
B. 至少有n-1条
C. 最多有n条
D. 至少有n条
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