简答题:<img src="http://www.weimei168.com/uploads/202208/161258144382831.png" width="470" height="74" /> <br /> (1)求z和y的值； <br /> (2)求可逆矩阵P，使P<img src="http://www.weimei168.com/uploads/202208/161258144916851.png" width="15" height="25" />BP=A．