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suma a 2 nr consecutive de 2 cifre este 144.

Răspuns :

aa+aa+1=144=>2aa=143=>aa=71,5=>aa+1=72,5.Proba:71,5+72,5=144
ab+ab+1=144
2×ab=144-1
ab=143:2

ab=71,5
ab+1=72,5