解 X，Y可取0,1,2[tex=1.786x1.0]dKW5YLkHBg1MkJLRhNUclw==[/tex]且[tex=2.786x1.071]uHabuvE++eu3ofWari0H7A==[/tex]，所以[tex=2.5x1.357]IBKmrYJOHWLEy5g/Hf/98g==[/tex]的分布律为：[tex=23.429x1.5]3F30OYZJa48TSJRQrlLkHdVFLwVXpxpqvFBZuCr11M/1miwJI0JcQrultHGN1TFiP7HZb1/4SedBYJ6XutWUC5ArJoQN0H4yE0vBNmpoZQT88vqWK06aFJJXgnUUwlwLJrweI4MMZjqBM49FTJr2zw==[/tex]也可以不用独立性，直接按定义计算：[tex=2.429x1.071]PpNpFcLW4EG6W9FnhaHE4A==[/tex]或[tex=2.357x1.214]PBNNOCfvQ574I2bYDlFq0A==[/tex]时，由于[tex=3.929x1.357]ffzVTxioy9kCaf8bVB8FMw==[/tex]，所以[tex=4.071x1.357]bVaejomKQudaqDysGswTmg==[/tex]；[tex=8.714x1.214]KnIjqwPXQEZCDZrOza5+LtD+z7iiS3be9uQAAR/ZR9oSIWS+FVRTBQl9SSQmNqH40RMcEWggPnmjLuZJxLFdyQ==[/tex]时，[tex=22.857x2.714]SlNfXegtUV6Oq22FseKw3hxSD0DPm6fRX7pkhzrfVm2XE3fRgvw8p9R8m0ykHavRXyMYV5ndLknRLNqXBkiT1WXVFbQnfW5pQKJuuxUjTBSiJYT2Mtp+K7MwLEdnAaGhlLZ5lpDC2tO25BHX+J2pSlgP6SySuybzQEr2NmX6CIs=[/tex][tex=6.857x1.214]KnIjqwPXQEZCDZrOza5+LhVr8fnJN8Y7uirvMctL7TQn7+tzNu5RyqYiqrViiOjU[/tex]时，[tex=12.714x2.786]SlNfXegtUV6Oq22FseKw3idytNyJUL+zJ1+DUDbAs/aEvpE+wItfuilNLahkSw8JtxO1HIelCT9jmJeU7BABWA==[/tex][tex=6.857x1.214]OPllocEKL5zQJfMkH3N0ieEBB0CTMkXv2C3++mt2u8pSp8J/b7IziK95F4jCc2fJ[/tex]时，[tex=12.643x2.786]SlNfXegtUV6Oq22FseKw3nmMOUs95GERSK6ZdZA+5Arrmjm+htwfRpZ2e6QmSK+9eOdvnA4adVlZyIe/xkK8GQ==[/tex][tex=5.071x1.214]j0I7u3S4vLfy2lYDJiOfyQ==[/tex]时[tex=12.214x2.786]SlNfXegtUV6Oq22FseKw3nmMOUs95GERSK6ZdZA+5AqhoasFoYzE4GJp2sAFar6eMR8XPmi7brNO6vwRoLZTTw==[/tex][tex=25.071x2.786]5rIEDUrMv5cgOpz/7ilRe7Dv9z0Q9o9YDWOizGElpuveUgchjMp6nQZzBOutmoZW2M3JVLmib3q2YJXHtAi8YHgQTJab/Q6DzC+20sU+UViF9U2nl6FIlRol4j5bo4gT[/tex]