28、设 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/03dc2fa866de121c60079e7c3c0c1ec8.png" ＼* MERGEFORMATINET
为齐次线性方程组 INCLUDEPICTURE ＼d "http://mooc1-2.chaoxing.com/ananas/latex/p/181683" ＼* MERGEFORMATINET
的解, INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/0ec1c289289586c124842686f7b692a5.png" ＼* MERGEFORMATINET
为非齐次线性方程组 INCLUDEPICTURE ＼d "http://mooc1-2.chaoxing.com/ananas/latex/p/23856" ＼* MERGEFORMATINET
的解,则( )
(1.0)
A. INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/25940044c519ca9424762cf1dcd641f4.png" ＼* MERGEFORMATINET 
B. INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/c851e62c6efb84346fa3b8eb559eb305.png" ＼* MERGEFORMATINET 
C. INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/c7da3295dfca86efa5d5a91715d20ee8.png" ＼* MERGEFORMATINET 
D. INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/6edb0e5171891a2cea8111d1d377d535.png" ＼* MERGEFORMATINET 
https://www.shititong.cn/cha-kan/shiti/0005b877-74f1-b1a8-c0ce-60519723ce00.html
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7
https://www.shititong.cn/cha-kan/shiti/0005b877-74f3-99f0-c0ce-60519723ce08.html
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6点,7边
https://www.shititong.cn/cha-kan/shiti/0005b877-74f3-3848-c0ce-60519723ce02.html
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74、一个盒子里有20个大小形状相同的小球,其中5个红的,5个黄的,10个绿的,从盒子中任取一球,若它不是红球,则它是绿球的概率是( )
(1.0)
A. 5/6
B. 3/4
C. 2/3
D. 1/3
https://www.shititong.cn/cha-kan/shiti/0005b877-74f3-47e8-c0ce-60519723ce00.html
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42、 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/62af7d4030bedeb78b2a3806a5bda2fe.png" ＼* MERGEFORMATINET
(1.0)
https://www.shititong.cn/cha-kan/shiti/0005b877-74f2-74f8-c0ce-60519723ce00.html
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11、已知两个线性变换
A. z=ABx
B. z=BAx
C. x=ABz
D. x=BAz
https://www.shititong.cn/cha-kan/shiti/0005b877-74f0-f240-c0ce-60519723ce02.html
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15、设有一个连通网络如图所示。试采用prim算法从顶点0开始构造最小生成树。( )( )
https://www.shititong.cn/cha-kan/shiti/0005b877-74f3-9220-c0ce-60519723ce00.html
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13、下列说法中错误的是( )
(1.0)
A. 反射变换,伸压变换,切变都是初等变换
B. 若M,N互为逆矩阵,则MN=E
C. 任何矩阵都有逆矩阵
D. 反射变换矩阵都是自己的逆矩阵
https://www.shititong.cn/cha-kan/shiti/0005b877-74f1-05c8-c0ce-60519723ce00.html
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8、 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/1dfc70d071d6369bf916779be9d6bc3c.png" ＼* MERGEFORMATINET
( )
https://www.shititong.cn/cha-kan/shiti/0005b877-74f3-7ab0-c0ce-60519723ce00.html
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62、下面那个不是两个图同构的必要条件( )
(1.0)
A. 顶点个数相等
B. 边数相等
C. 度数相同的顶点个数相相同
D. 两个图的形状相同
https://www.shititong.cn/cha-kan/shiti/0005b877-74f3-0968-c0ce-60519723ce00.html
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,|b|=2,且( )⊥a,则向量a和b的夹角是________度.
