<p>设二维随机变量（X，Y)的分布律为 <img src="https://learnfile.20230611.cn/learnAppQuestion/78/dc/78dc7ddd072d54d9ce74bd1f1f6100c0.jpg" style="width: 100%;height: auto;"><img src="https://learnfile.20230611.cn/learnAppQuestion/36/9e/369ee617af52701ce66b5f708191937