<p>设二维随机变量<img src="https://learnfile.20230611.cn/learnAppQuestion/35/e4/35e42707bb6f48f81062a3e3ca769395.jpg" style="width: 100%;height: auto;">的概率密度为<img src="https://learnfile.20230611.cn/learnAppQuestion/43/f3/43f349f2f7719038b6051f1f5f8b5bf9.jpg