Evaluate: 15÷[(-2)+(-1)]
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3
15
=
10
+2
5
+2
10
−
5
−4
5
15
=
3
10
−3
5
15
=
10
−
5
5
=
(
2
−1)
5
=
(
2
−1)(
2
+1)
5
(
2
+1)
=
10
+
5
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