Răspunsuri

2014-11-16T16:22:42+02:00
Cel mai inteligent răspuns!
2014-11-16T16:23:03+02:00
Ma=(x+9+2x)/3
18=(3x+9)/3
3x+9=18·3
3x=54-9
x=45/3
x=15
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