Răspunsuri

2014-08-29T15:52:10+03:00
2a -40= a/3  aducem la acelasi numitor

6a-120=a

6a-a=120

5a=120

a=24
2014-08-29T15:55:30+03:00
A * 2 - 40 = a " 3
_____/_____/  2a
__/__/__/        a : 3
40 : 5 = 8
8 * 3 = 24
a = 24