Răspuns :
a+b=54 =>a=54-b
a=4(b-a) =>a=4b-4a => 5a=4b
=>5(54-b)=4b
270-5b=4b
270=9b
b=30
a=54-30=24
a=4(b-a) =>a=4b-4a => 5a=4b
=>5(54-b)=4b
270-5b=4b
270=9b
b=30
a=54-30=24
a+b=54
b=4(a-b)
b=4a-4b
b+4b=4a
5b=4a
b=4a/5
4a/5 +a=54 aducem la acelasi numitor
4a+5a=270
9a=270
a=30 b=120/5=24
b=4(a-b)
b=4a-4b
b+4b=4a
5b=4a
b=4a/5
4a/5 +a=54 aducem la acelasi numitor
4a+5a=270
9a=270
a=30 b=120/5=24