设4个3维列向量<imgwidth="94"height="26"v:shapes="_x0000_i1127"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image146.png">组成的矩阵经初等行变换后变为<imgwidth="266"height="84"v:shapes="_x0000_i1128"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image148.png">,则<imgwidth="22"height="26"v:shapes="_x0000_i1129"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image150.png">可表示为<imgwidth="38"height="26"v:shapes="_x0000_i1130"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image152.png">()
①
<imgwidth="92"height="26"v:shapes="_x0000_i1131"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image154.png">
②
<imgwidth="120"height="26"v:shapes="_x0000_i1132"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image156.png">
③
<imgwidth="110"height="26"v:shapes="_x0000_i1133"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image158.png">
④
<imgwidth="56"height="26"v:shapes="_x0000_i1134"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image160.png">