Symbol by Mr.Chopinfan, on Flickr

How are these three symbols different? i don't know even their name. I can play tr but i'm confused the first two.
pls give me explanations and examples.

The first is called a "turn" or more properly a gruppetto or cadence. The second is a trill. How to play these is way beyond the scope of a simple post and is dependent upon the literature, the composer, and yes the performer. It should be well thought out and supported. You need to begin by examining the table of ornaments found in the Klavierbüchlein für Wilhelm Friedemann Bach written by J.S. Bach. It may be seen at: http://en.wikipedia.org/wiki/Ornament_(music)

Good luck,
Eddy

See e.g. http://www.pennuto.com/music/jsb_ornm.htm

thank you. I'd searched and asked in piano forum in my country for several months but no one knows and answers me but i have very quick replies in this forum. I understand much better now. thanks. I'll keep practicing.