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esercizio 59 - capitolo capitolo 1: i numeri naturali e i numeri interi
Answers:
(
5
+
7
)
+
8
=
12
+
8
=
20
(5+7)+8 = 12+8=20
(
5
+
7
)
+
8
=
12
+
8
=
20
;
5
+
7
+
8
=
20
5+7+8=20
5
+
7
+
8
=
20
7
+
(
2
⋅
3
)
=
7
+
6
=
13
7+(2\cdot 3) = 7+6=13
7
+
(
2
⋅
3
)
=
7
+
6
=
13
;
7
+
2
⋅
3
=
7
+
6
=
13
7+2\cdot 3 = 7+6=13
7
+
2
⋅
3
=
7
+
6
=
13
20
:
(
5
−
4
)
=
20
:
1
=
20
20:(5-4)=20:1=20
20
:
(
5
−
4
)
=
20
:
1
=
20
;
20
:
5
−
4
=
4
−
4
=
0
20:5-4=4-4=0
20
:
5
−
4
=
4
−
4
=
0