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A+b+c=879
a=251
b=a-32
c=?
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Afla al treilea termen.


Răspuns :

a + b + c = 879
b = a - 32
b = 251 - 32 
b = 219
251 + 219 + c = 879
c = 879 - 470
c = 409
a=251
b=a-32
b=251-32
b=219
251+219+c=879
470+c=879
c=879-470
c=409