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Calculeaza:
a) 2•17 grade 15 minute+5•17grade 15 minute=?
b) 85 grade 25 minute : 2 + 85 grade 25 minute : 3=?
c) 12•38 grade 29 minute - 7•38 grade 29 minute=?

Ajutor, nu stiu, dau coroana!! !!