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11. (a + b) + 4 = (b + a) +4 12. (1/8) 8 = 1 13. 2/3 + (-2/3) = 0 14. x (y + 0) + z = xy + z 15. (x-y)(1/x - y) = 1, x = 0 Ayuda por favor tengo que formular una propiedad basica del sistema de numeros reales para justificar cada uno de los enunciados dados
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