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14. Suma algebraica + videos
Contributed by:
Morales
a)
b)
-15
+x
2
?
-7
+x
2
?
0
?
+-x
2
-x
2
?
+x
?
+8x
-3
?
-9
+x
?
-x
2
?
-7x
?
-7x
?
-8x
?
-12
+9
?
-8x
?
-x
+12
?
-3
?
-8
+12
?
+9
?
+8x
a)
c)
e)
b)
f)
d)
-d
d
4
-e
e
?
-f
?
e
2
-f
2
e)
a)
c)
d)
b)
f)
a)
c)
b)
d)
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