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Suma a 3 numere este 75. Daca scadem din fiecare acelasi nr obtinem 17,19,21.Care sunt numerele?



Răspuns :

a+b+c=75
75-(17+19+21)=75-57=18
18:3=6
a=17+6=23 
b=19+6=25
c=21+6=27

a+b+c=75. a=|___|+17|. b=|___|+19|. c=|___|+21|. 75-17-19-21=18. 18:3=6 (un segment). 6+17=23 (a). 6+19=25 (b). 6+21=27 (c). Verificare: 23+25+27=48+27=75.