11、 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/fd037810c400155720036a1026e426b2.png" ＼* MERGEFORMATINET
请回答是还是否?
( )

24、给出下列命题:
①零向量的长度为零,方向是任意的;
②如a,b都是单位向量,则a=b;
③向量AB与BA相等。
则所有正确命题是( )
(1.0)

23、下列说法不正确的是( )
(1.0)

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)

21、下列线性变换中(不会)使正方形变为其他图形的是( )
(1.0)

20、点通过矩阵 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/77cfeea72c7c2277b32e0dc0267f1377.png" ＼* MERGEFORMATINET 和 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/73a9947e3388336d31daf01af0b631f0.png" ＼* MERGEFORMATINET 的变换效果相当于另一变换是( )
(1.0)

19、下面不是普通坐标(2,3)的齐次坐标的是( )
(1.0)

18、下列矩阵不可逆的是( )
(1.0)

17、设矩阵 INCLUDEPICTURE ＼d "http://mooc1-2.chaoxing.com/ananas/latex/p/555929" ＼* MERGEFORMATINET , INCLUDEPICTURE ＼d "http://mooc1-2.chaoxing.com/ananas/latex/p/581268" ＼* MERGEFORMATINET ,则 INCLUDEPICTURE ＼d "http://mooc1-2.chaoxing.com/ananas/latex/p/320327" ＼* MERGEFORMATINET ( )
(1.0)

16、下列矩阵(不存在)逆矩阵的是
(1.0)

15、设n阶矩阵满足ABC=E,则有( )
(1.0)