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Rezolva in doua moduri:
a)7×(123234+2372)=
b)21×47+1532×21-21×12=
va rog e pt maine


Răspuns :

7×(123234+2372)=7x123234+7x2372

21×47+1532×21-21×12= 21x47+1532x21-21x12