Mathematics

It is interesting that we can do Math in DrRacket.
For example, (+ 1 2) means one plus two and the result is simply three.
 (* 1 2 ) means one times two which is equal to two.
(/ 3 1) means three divided by one which is equal to three.
(- 4 3) means four minus three which is equal to one.

  If there are any confusions, feel free to correct me or advise me!

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