简答题:设<img src="http://www.weimei168.com/uploads/202208/161258070790321.png" width="20" height="29" />，<img src="http://www.weimei168.com/uploads/202208/161258071218071.png" width="24" height="29" />是Ax=0的基础解系，证明：<img src="http://www.weimei168.com/uploads/202208/161258070790321.png" width="20" height="29" />+<img src="http://www.weimei168.com/uploads/202208/161258071218071.png" width="24" height="29" />，2<img src="http://www.weimei168.com/uploads/202208/161258070790321.png" width="20" height="29" />一<img src="http://www.weimei168.com/uploads/202208/161258071218071.png" width="24" height="29" />也是它的基础解系．