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daca a+b=15 si b+c=23, calculati a+2*b+c=

Răspuns :

a+b=15
b+c=23              (Adun cele 2 relatii)
a+2b+c=38
A + B = 15
B + C = 23, LE ADUNAM
 _____________
 A + 2B + C = 38