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Rezolva in doua moduri :

21x47+1532x21-21x12


Răspuns :

21x47+1532x21-21x12=
21x(47+1532-12)=
21x(1579-12)=
21x1567=32907

21x47+1532x21-21x12=
987+32172-252=
33159-252=32907