Respuestas

2014-02-10T20:52:43+01:00
(2 + 3) + 5 = 10
(5 + 3) + 2 = 10
b)
(-3 + 4) + 5 = 6
(4 + 5) – 3 = 6
c)
(7 + 8) + 15 = 30
(8 + 15) + 7 = 30