<p>设二维随机变量<img src="https://file.gaojiufeng.cn/learnAppQuestion/c2/8d/c28dabe0f684fdbc10ca59d03592f29b.jpg" style="width: 100%;height: auto;">的概率密度为<img src="https://file.gaojiufeng.cn/learnAppQuestion/d5/14/d5140b86ff27d6b956bad84752563c00.jpg" style="width: 100%;height: auto;">求：（1）<img src="https://file.gaojiufeng.cn/learnAppQuestion/c2/8d/c28dabe0f684fdbc10ca59d03592f29b.jpg" style="width: 100%;height: auto;">关于X,Y的边缘概率密度<img src="https://file.gaojiufeng.cn/learnAppQuestion/70/bf/70bf6002db29e4bb6f5b4273774b05f0.jpg" style="width: 100%;height: auto;">；（2）<img src="https://file.gaojiufeng.cn/learnAppQuestion/7a/1f/7a1f862eba863111d89daa63eb1daa06.jpg" style="width: 100%;height: auto;">.</p>