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calculati cit mai simplu 21pe23+2121pe2323+212121pe232323+21212121pe23232323 ? cine ma poate ajuta...va rog.. multumesc

Răspuns :

21/23*(101/101+10101/10101+1010101/1010101)= 21/23*(1+1+1)=21/23*3=63/23=2 si 17/23