,则 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/e17a3b2ad5a6d579639f5df659fad89a.png" ＼* MERGEFORMATINET 
答案：
第1空:
-4.5;-9/2
第2空:
,则 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/e17a3b2ad5a6d579639f5df659fad89a.png" ＼* MERGEFORMATINET 答案：
第1空:
-4.5;-9/2
第2空:
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
A. 1
B. 2
C. 3
D. 4
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 
A. 1
B. 2
C. 3
D. 4
,|b|=2,且( )⊥a,则向量a和b的夹角是________度.
矩阵,齐次线性方程组 INCLUDEPICTURE ＼d "http://mooc1-2.chaoxing.com/ananas/latex/p/181683" ＼* MERGEFORMATINET 
仅有零解的充要条件是 INCLUDEPICTURE ＼d "http://mooc1-2.chaoxing.com/ananas/latex/p/53238" ＼* MERGEFORMATINET 
A. 小于m
B. 小于n
C. 等于m
D. 等于n
A. 转移概率矩阵为P, INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/ac442473ae925a595caa561099f38720.png" ＼* MERGEFORMATINET 
B. 若 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/c6c825aa831220855e505785daab06ce.png" ＼* MERGEFORMATINET 
,则 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/92b22837f266b5578e50fe1899f2228a.png" ＼* MERGEFORMATINET 
C. 每个转移概率矩阵都有唯一对应的稳态向量,稳态向量就是转移概率矩阵属于特征值为1的特征向量。
D. 转移概率矩阵每个元素表示转移的比例,所以每一行元素之和为1
