<p>设二维随机变量（X，Y）的分布律为 <img src="https://learnfile.20230611.cn/learnAppQuestion/dd/7a/dd7a5337d5b57c6aba2d4f360b4b7356.jpg" max-width="300" style="width: 100%;height: auto;"><img src="https://learnfile.20230611.cn/learnAppQuestion/74/61/746114cff2b7d97