Question

determinati numerele naturale a,b,c,stiind ca a + b = 84,b + c = 64,a + c = 34

Answer 1

a+b=84
b+c=64
a+c=34
2a+2b+2c=182
2(a+b+c)=182⇒a+b+c=91
a+b+b+c=148
a+b+c+b=148
91+b=148⇒b=57
a+57=84⇒a=27
27+c=34⇒c=7