Explicación paso a paso:
3)
12+ 9 -14+ 7-8
21 -14+ 7-8
7+ 7-8
14 - 8
6
4)
-11+(- 4)
-11-4
-15
5)
8+(-3) +5
8 - 3 +5
5 + 5
10
6)
10 - 12+ 6-4 - 9
-2+ 6-4 - 9
4-4 - 9
0-9
-9
7)
12 -(-5)+9 =
12+5+9
17+9
26
8)
-4+9-11+8+7=
5-11+8+7
-6+8+7
2+7
9
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Explicación paso a paso:
3)
12+ 9 -14+ 7-8
21 -14+ 7-8
7+ 7-8
14 - 8
6
4)
-11+(- 4)
-11-4
-15
5)
8+(-3) +5
8 - 3 +5
5 + 5
10
6)
10 - 12+ 6-4 - 9
-2+ 6-4 - 9
4-4 - 9
0-9
-9
7)
12 -(-5)+9 =
12+5+9
17+9
26
8)
-4+9-11+8+7=
5-11+8+7
-6+8+7
2+7
9