Calcolare.
2
2
2
2
x
+
+
+
+
+
x
x
x
x
28
=
=
=
=
=
28
29
20
30
30
x
x
x
x
x
=
=
=
=
=
.....
.....
.....
.....
.....
x
x
x
x
x
+
+
+
+
+
2
2
2
2
2
=
=
=
=
=
26
25
22
29
23
x
x
x
x
x
=
=
=
=
=
.....
.....
.....
.....
.....
x
x
x
x
x
+
+
+
+
+
2
2
2
2
2
=
=
=
=
=
24
27
28
30
20
x
x
x
x
x
=
=
=
=
=
.....
.....
.....
.....
.....
x
x
x
x
x
+
+
+
+
+
7
17
27
23
26
=
=
=
=
=
9
19
29
25
28
x
x
x
x
x
=
=
=
=
=
.....
.....
.....
.....
.....
x
x
x
x
x
+
+
+
+
+
21
25
22
24
28
=
=
=
=
=
23
27
24
26
30
x
x
x
x
x
=
=
=
=
=
.....
.....
.....
.....
.....
22
28
26
24
30
-
-
-
-
-
x
x
x
x
x
=
=
=
=
=
20
26
24
22
28
x
x
x
x
x
=
=
=
=
=
.....
.....
.....
.....
.....
20
21
25
24
27
+
+
+
+
+
x
x
x
x
x
=
=
=
=
=
23
24
28
27
30
x
x
x
x
x
=
=
=
=
=
.....
.....
.....
.....
.....
22
25
20
24
21
+
+
+
+
+
x
x
x
x
x
=
=
=
=
=
26
29
25
28
25
x
x
x
x
x
=
=
=
=
=
.....
.....
.....
.....
.....
21
22
23
24
35
+
+
+
+
+
x
x
x
x
x
=
=
=
=
=
26
27
28
29
30
x
x
x
x
x
=
=
=
=
=
.....
.....
.....
.....
.....
26
x
x
x
x
+
+
+
+
+
x
4
5
3
3
=
=
=
=
=
30
30
30
30
24
x
x
x
x
x
=
=
=
=
=
.....
.....
.....
.....
.....