【单选题】
已知向量组a1,a2,a3,a4线性无关,则向量组( )
①
a1+a2,a2+a3,a3+a4,a4+a1线性无关
②
a1-a2,a2-a3,a3-a4,a4-a1线性无关
③
a1+a2,a2+a3,a3+a4,a4-a1线性无关
④
a1+a2,a2+a3,a3-a4,a4-a1线性无关
【单选题】
已知向量<imgwidth="288"height="114"v:shapes="_x0000_i1294"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image366.png">,若<imgwidth="18"height="22"v:shapes="_x0000_i1295"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image368.png">可由<imgwidth="70"height="26"v:shapes="_x0000_i1296"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image279.png">线性表出那么()
①
<imgwidth="45"height="22"v:shapes="_x0000_i1297"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image371.png">,<imgwidth="49"height="22"v:shapes="_x0000_i1298"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image373.png">
②
<imgwidth="45"height="22"v:shapes="_x0000_i1299"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image371.png">,<imgwidth="49"height="22"v:shapes="_x0000_i1300"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image373.png">
③
<imgwidth="45"height="22"v:shapes="_x0000_i1301"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image375.png">,<imgwidth="49"height="22"v:shapes="_x0000_i1302"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image373.png">
④
<imgwidth="45"height="22"v:shapes="_x0000_i1303"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image371.png">,<imgwidth="49"height="22"v:shapes="_x0000_i1304"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image377.png">