题目

Roughly the size of a soda can, sitting on a bookshelf, a relatively harmless device (设备) may be turning friends away from your home. The elephant in your living room is your Internet-connected camera, a device people are increasingly using for peace of mind in their homes. But few stop to think about the effect these devices may have on house guests. Should you tell your friends, for instance, that they're being recorded while you all watch the big game together?“It's certainly new territory, especially as home security cameras become easier to fix,” says Lizzie Post, president of the 如图，已知在Rt△OAC中，O为坐标原点，直角顶点C在x轴的正半轴上，反比例函数y=（k≠0）在第一象限的图象经过OA的中点B，交AC于点D，连接OD．若△OCD∽△ACO，则直线OA的解析式为　　　　　　．