Răspunsuri

2014-10-27T21:37:07+02:00
Ma=(x+9+2x)/3
(3x+9)/3=7
3x+9=7·3
3x=21-9
x=12/3
x=4
10 4 10
2014-10-27T21:39:59+02:00
(x+9+2totul.supra2)·x=7
x+9+2totul.supra2=7x
x+9+2=14x \-x
11=13x
x=13supra11
3 4 3