Răspunsuri

2014-04-22T13:56:13+03:00
X/2 + 9/2 = 2x
9/2=2x-x/2
(4x-x)/2=9/2
3x=9
x=3
5 4 5
Cel mai inteligent răspuns!
2014-04-22T13:56:27+03:00
X/2 +9/2=2x  aducem la acelasi numitor
x+9=4x
x-4x=-9
-3x=-9
3x=9
x=3
7 4 7