Respuesta:
a. 7
b. -30
c. -1
Explicación paso a paso:
a. 12 + -5 = 7 + 3 = 10 + -3 = 7
b. -20 + -5 = -25 + 5 = -20 + -10 = -30
c. 8 + 4 = 12 + -7 = 5 + -6 = -1
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Respuesta:
a. 7
b. -30
c. -1
Explicación paso a paso:
a. 12 + -5 = 7 + 3 = 10 + -3 = 7
b. -20 + -5 = -25 + 5 = -20 + -10 = -30
c. 8 + 4 = 12 + -7 = 5 + -6 = -1