已知随机事件A, B满足条件，且，则
（ ）。https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/ec7f9cf72cd44c73a28e8eb4aa4003ec.png
（ ）。https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/ec7f9cf72cd44c73a28e8eb4aa4003ec.png
举一反三
- 若事件相互独立，且，则 ( )。https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/15056ca05cbe40bf8943402fa1aa9a97.png
- 设随机变量X~N(4,2)，则其特征函数为(). A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/357ad388efa144a1a2b824e2b1ded239.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/d52e72841a81484981168cbb693bad24.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/00e1e0c2bba04889b58eb483c88821fb.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/1851c30670244a5c821128d6c44a3ecc.png" >
- 下列逻辑命题正确的是（）。 A: 若Y=A+B则<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/2ac821feb3d7451a8c7c69c97de1ca39.png">=<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/d900fde7b3dc4b2ea24859c0712ddd0c.png"> B: 若A+B=A+C则B=C C: 若Y=A+B则<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e305d54dd8c94adfaf570a2f0e6d4421.png">=<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/3cb33b429abf4ec397173f58dcdd37af.png">+<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/87aa5698238b4b66b9264426769b7b17.png"> D: 若AB=AC则B=C
- 10人中至少有2人同生日的概率是多少？（1年按365天计算）() A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/f3b577db2dd0429b9eab51dff5644b23.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/6f30552128e14bfb89b26b30ac2b72db.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/fa8f9ba9bd2d4a40b7d007fd9e9988fd.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/05a12b5d4da04e2c9ea779b313981c83.png" >
- 设则＝（ ） 。https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/30c573e7ca79488fb1ae28beed5356e9.png