Răspuns :
{a;b} dp {3;7}
2a+4=b
a/3=b/7=k ==> a=3k
b=7k
2.3k+4=7k
6k+4=7k
6k-7k=-4
-k=-4 ==> k=4 ==> a=3.4=12
b=7.4=28
2a+4=b
a/3=b/7=k ==> a=3k
b=7k
2.3k+4=7k
6k+4=7k
6k-7k=-4
-k=-4 ==> k=4 ==> a=3.4=12
b=7.4=28
a=3k b=7k 6k+4=7k 6k-7k=-4 => -k=-4(*-1) =>k=4
a=3*4 a=12
b=7*4 b=28
a=3*4 a=12
b=7*4 b=28