12
4. Verify that (a + b) + c = a + (b + c) by taking
-5
(a) a = 2,65
5
6
and c =
=
3
oo
-9
3
-9
(b) a =
b=
and c =
11
-5
22
--3
-2
3
(c) a = -1, b =
and c =
4
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