设随机变量X的分布函数 则P(X=5)=2/3.https://img-ph-mirror.nosdn.127.net/0rDVwfafl0wWg4kmf0GicQ==/6630190355419977757.png

【阅读理解】1、https://mp.weixin.qq.com/s/X3eP9Iw2_66FwOgYN9IOxA 2、 https://mp.weixin.qq.com/s/lfIADfMTCW4eMDR34H3YEA 3、https://mp.weixin.qq.com/s/3uP3EzAEHTALpHySBHtQ3Q 4、https://mp.weixin.qq.com/s/4VGFiv3tlG6iy5PaAGytjQ

挖一个100m 3的基坑，，土全部外运，需弃土 m 3。https://p.an...c2795b45f1cfdbc9.png

识图题3：这是什么结构https://p.ananas.chaoxing.com/star3/origin/c6be927f491ee20405c44f4e658f08c3

【其它】APICloud开发环境搭建 1、注册APICloud账号,注册地址:https://docs.apicloud.com/; 2、下载安装APICloud studio 2开发工具,下载地址: https://www.apicloud.com/devtools ; 3、下载安装APPLoader调试器,下载地址:https://docs.apicloud.com/Download/download; 4、下载安装夜神模拟器,下载地址:https://www.yeshen.com/。 说明:以截图的方式分别提交第2、3、4项效果图

Matlab命令A=magic(3)创建一个3阶魔方矩阵，求A的逆矩阵用（ ）. A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/4a74527efd484dd8b5c75050a75c1641.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/0bad2e09e7384b81890448a707e1f260.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/6164767c2a40423d938b2b87dd52cd3d.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/5812422f3e1a4a7185ba0e187c5d21df.png" />

Matlab命令A=magic(3)创建一个3阶魔方矩阵，求A的特征值的绝对值的最小值用（ ）. A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/d605a0a8e560440081a209fc0da04637.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/e36ed713fb2e481ab69ecd158317c17e.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/6cd6fb595e6d45fd962a01d8b6ac10f5.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/64c2c88e6099475dbacd7e6d12841129.png" />

某人举步上楼梯，每步跨1个台阶或2个台阶，设上n个台阶的不同方式数为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/62999550ec1547439283cd9872427fdc.png" />，则( ). A: 初始条件为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/e5083263b09044c1b6e95baed3ef628c.png" />=1，<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/07aa95ceccda433f8e9432a186fae005.png" />= 2, 递归关系为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/ad0a958e510040be8f4253d0526d7ce5.png" />(n≥3). B: 初始条件为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/d5cc33a9d0714d3fbba386ccff5f8aaa.png" />=1，<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/34a42e4a62ea448db919ffa607f5de44.png" />= 1, 递归关系为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/c3dc9b741afa4ae68983bc1d5db5e065.png" />(n≥3). C: 初始条件为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/405917811f9845e1915af00c9fa30c79.png" />=1，<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/ccd3e7a79651413b8cd22dbf5cd05ac8.png" />=1, 递归关系为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/0acc9967cdab4f31a918b5fc8fe38608.png" />(n≥3). D: 初始条件为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/245baeee86b943e4bd7f1c39803b142c.png" />=1，<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/a06359868bb1457e81ab7e102d212630.png" />= 2, 递归关系为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/0aee376a7bfa44da9f431ecb21e6c787.png" />(n≥3).

下列化合物是(CH3)2CHCH2OC(CH3)3键线式是https://p.a...bb2c534593130df1.jpg

错误1： 错误2： 错误3： 错误4：https://p.ananas.chaoxing.com/star3/origin/f3848a1490dc70b67502f23cb8a243a3.jpg