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All published worksheets from
http://sagenb.org
sagenb.org published worksheets
pub
/
901-1001
/
902.sagews
2
2
4
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ubuntu2004
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var
(
'a,b'
)
(a, b)
-
(
a
+
b
)
+
(
-
3
*
a
+
b
-
(
-
2
*
a
+
b
-
(
a
-
b
)
)
+
2
*
a
)
a - 2*b
