N= 4 6 8 3 4 2 18+ + + = 12 8 3 4 4 6 4 2 2+ + + + + = = (2 3 2+ )...
83.
N
=
4 6 8 3 4 2 18
+
+
+
=
12 8 3 4 4 6 4 2 2
+
+ +
+
+
=
=
(
2 3 2
+
)
2
+
2 2 2 3 2
(
+ + =
)
2
(
2 3 2
+ +
2
)
2
=
2 3
+
2 2
+
.
83.
N
=
4 6 8 3 4 2 18
+
+
+
=
12 8 3 4 4 6 4 2 2
+
+ +
+
+
=
=
(
2 3 2
+
)
2
+
2 2 2 3 2
(
+ + =
)
2
(
2 3 2
+ +
2
)
2
=
2 3
+
2 2
+
.