Răspunsuri

2014-04-26T16:42:24+03:00

a+b=140
a=2b/5
2b/5+b=140  aducem la acelasi numitor
2b+5b=700
7b=700
b=100
Cel mai inteligent răspuns!
2014-04-26T16:45:14+03:00
A+b=140
a=2/5*b
a=2b/5
2b=5a
a+b=140/*2
2a+2b= 280
2a+5a=280
7a=280/:7
a=40
b=100
1 5 1