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b) 525 + 250 + 450 = (525 + 250) + 450 = 525 + (250 + 450) = 1225
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a) 57 + 23 + 68:
(57 + 23) + 68
80 + 68
148 ==> Respuesta
b) 525 + 250 + 450:
(525 + 250) + 450
775 + 450
1225 ==> Respuesta
Espero que te ayude.
Saludos!!!