Răspuns :
a-b=84 a/b=2/5. a/2=b/5=k -> a=2k b=5k
2k-5k=84. -3k=84 k=-28 ->a=-56 b=-140k
b-a=84
a/b=2/5⇒5a=2b⇒a=2b/5
b-2b/5=84
(5b-2b)/5=84
3b=84·5
b=420/3
b=140
a=140-84
a=56
a/b=2/5⇒5a=2b⇒a=2b/5
b-2b/5=84
(5b-2b)/5=84
3b=84·5
b=420/3
b=140
a=140-84
a=56