<p>设z=x＋y＋<img src="https://learnfile.20230611.cn/learnAppQuestion/48/83/4883b07f06e11a623ac6da086e32ce6c.jpg" style="width: 100%;height: auto;">，求<img src="https://learnfile.20230611.cn/learnAppQuestion/57/54/575458bd16cce337d55300837689a306.jpg" st