Explicación paso a paso:
45 + (42 - 18 + 6) - 18 + 9 - 6
45 + 30 - 18 + 9 - 6
84 - 24
60
17 + 20 - (15 +8) + (8 - 4) + 9
17 + 20 - 23 + 4 + 9
50 - 23
27
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Verified answer
Explicación paso a paso:
45 + (42 - 18 + 6) - 18 + 9 - 6
45 + 30 - 18 + 9 - 6
84 - 24
60
17 + 20 - (15 +8) + (8 - 4) + 9
17 + 20 - 23 + 4 + 9
50 - 23
27