Răspuns :
a+b=1446
b+c=1234
a+c=6785
adunam cele 3 relatii:
a+b+b+c+a+c = 1 446 + 1 234 + 6 785
2×a + 2×b + 2×c =9 465
2 × (a + b + c) = 9 465
b+c=1234
a+c=6785
adunam cele 3 relatii:
a+b+b+c+a+c = 1 446 + 1 234 + 6 785
2×a + 2×b + 2×c =9 465
2 × (a + b + c) = 9 465