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2) Calculati: a) 123+234; b) 234+345; c) 345+456; d)456+567; e)?; f)?.

Răspuns :

a)=357
b)=579
c)=801
d)=1023
e)567+678=1245
f)678+789=1467
123+234=357
579
801
1023

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