命题“∀x∈R，x2-x+1＞0”的否定是______． 发布时间：2017-04-18 02:49 │ 来源：www.tikuol.com 题型：填空题 问题： 命题“∀x∈R，x2-x+1＞0”的否定是______．
题型：填空题 下列各句中均有一处错误，请找出并改正。1. What about write a report about that?2. I learn Russian by me.3. I hope seeing you very soon.4. Look! This is a old pencil-box of my brother's.5. There are six peoples in her family.6. The old man on the middle is Jeff's father.7. Which kite is yours?The it on the wall.8. who's that boy between your mother or father?________________________________________ 查看答案