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Respuestas a la pregunta
Respuesta:
a) 5-(7-2-(1-9)-3+12)+4 d) 28-[21-(12-3)-7]
5-(7-2-(-8)-3+12)+4 28-[21-(9)-7]
5-(7-2+8-3+12)+4 28-[5]
5-(22)+4 23
-13
b) 1-(-3+6+1)-[4-(6-3+1)-2] e)[-2+3×(2-5)÷3]-[(3-5+2)-2×(3-4)]
1-(4)-[4-(4)-2] [-2+3×(-3)÷3]-[(0)-2×(-1)]
1-4-[-2] [-2-3)]-[2]
1-4+2 [-5]-[2]
-1 -7
c) 6-(-9+7-1)-[3-(-5+4+6)-1] f) 8-[6-(-3+7)-6]+4
6-(-3)-[3-(5)-1] 8-[6-(4)-6]+4
6+3-[-3] 8-[-4]+4
6+3+3 8
12