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a) 12 + 15 : 3 - 10 = 12 + 5 - 10 = 17 - 10 = 7
b) 8 + 4 x 3 - 10 + 5 : 5 = 8 + 12 - 10 + 1 =
20 - 10 + 1 = 10 + 1 = 11
c)108 + 9 x 4 - 120 : 2 = 108 + 36 - 60 =
144 + 60 = 204
d) 6 - 12 : 3 + 90 : 3 x 4 = 6 - 4 + 30 x 4 =
2 + 120 = 122
Espero que te sirva ,suerte !!!