Explicație pas cu pas:
Folosind proprietatea asociativă, putem rearanja termenii pentru a face calculele mai simple:
a)
(
−
13
+
105
)
+
13
(−13+105)+13
=
(
105
−
13
)
+
13
=(105−13)+13
=
105
=105
b)
(
−
12
+
137
)
+
(
−
88
+
63
)
(−12+137)+(−88+63)
=
(
137
−
12
)
+
(
63
−
88
)
=(137−12)+(63−88)
=
125
−
25
=125−25
=
100
=100
c)
(
−
15
−
45
)
−
40
(−15−45)−40
=
(
−
60
)
−
40
=(−60)−40
=
−
100
=−100
d)
�
−
(
2347
−
400
)
+
347
g−(2347−400)+347
=
�
−
1947
+
347
=g−1947+347
=
�
−
1600
=g−1600
e)
556
−
(
173
+
44
)
−
27
556−(173+44)−27
=
556
−
217
−
27
=556−217−27
=
312
−
27
=312−27
=
285
=285
f) (
−179+47)+(−47)
(−179+47)+(−47)
=
(−179+47−47)
=(−179+47−47)
=−179