Răspunsuri

2014-08-04T14:30:23+03:00
F+b=23

b-30% din f=f

b- 30/100*f=f

b-3f/10=f  aducem la acelasi numitor

10b-3f=10f

10b=10f+3f

10b=13f

b=13f/10

13f/10+ f=23  aducem la acelasi numitor

13f+10f=230

23f=230

f=10

b=13*10/10=13
13 4 13