those tables created by an program i was installed it in my computer.
i was uninstalled this program and those tables still on my database.
i want to drop this tables so i use drop table command, the command executed successfully but when i refresh tables i found it again...
the drop executed successfully..
the problem was in installed an program that created some files on my local machine,These files are responsible for creating tables.
so i was delete these files and drooped tables from my database and no longer exist.
thanks all