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∣
1
∣
+
∣
−
1
∣
|1| + |-1|
∣
1
∣
+
∣
−
1
∣
∣
1
∣
+
∣
−
1
∣
|1| + |-1|
∣
1
∣
+
∣
−
1
∣
∣
1
∣
=
1
|1| = 1
∣
1
∣
=
1
∣
−
1
∣
=
1
|-1| = 1
∣
−
1
∣
=
1
1
+
1
=
2
1 + 1 = 2
1
+
1
=
2