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int-ro dumbrava cresteau 278 copaci . Citi copaci de fiecare fel erau, stiind ca Nuci si Aluni erau 178, iar Aluni si Stejari 207 copaci?


Răspuns :

a=nuci,b=aluni ,c=stejari
a+b+c=278
a+b=178
b+c=207
178+c=278
c=278-178=100 stejari
a+207=278
a=278-207=71 nuci
100+b+71=278
b=278-171=107  aluni
a+b+c=278; a+b=178; b+c=207; 178+c=278; c=278-178=100 -stejari; a+207=278; a=278-207=80 nuci; b=278-180=98 aluni