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Operations with rational numbers
a
b
+
c
d
=
a
d
+
b
c
b
d
Addition
a
b
-
c
d
=
a
d
-
b
c
b
d
Subtraction
a
b
·
c
d
=
a
c
b
d
Multiplication
a
b
:
c
d
=
a
d
b
c
Division
Keywords: