Question

28-{21-(12-3)-7]
-15
+30
+23

Answer 1

Respuesta:

c) +23

Explicación paso a paso:

28 - {21 - (12 - 3) - 7]

= 28 - {21 - 9 - 7]

= 28 - {12 - 7]

= 28 - 5

= 23 = +23