简答题:<img src="http://www.weimei168.com/uploads/202208/161267053829401.png" width="171" height="70" /> <br /> (1)求A的相似标准形，即P<img src="http://www.weimei168.com/uploads/202208/161267039865961.png" width="15" height="25" />AP=A； <br /> (2)求A 的正交相似标准形即Q<img src="http://www.weimei168.com/uploads/202208/161267040341441.png" width="14" height="25" />AQ=A，且Q<img src="http://www.weimei168.com/uploads/202208/161267041084871.png" width="14" height="25" />=Q<img src="http://www.weimei168.com/uploads/202208/161267041537101.png" width="15" height="25" />．