[racket] define, let, and any other options?

From: 김태윤 (kty1104 at gmail.com)
Date: Tue Oct 19 04:51:45 EDT 2010

hello
every time I want to use variable,
do I have to use "define" for global scope
and "let" for local scope?
I can't use define in function and I have to define body when I using "let"
is there any easy way to use variable? as like other language?
thanks in advanced
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