Răspunsuri

2014-10-12T14:00:28+03:00
Dai factor comun pe x
[(37+83):x ]:2 = 15

(120:x) :2 = 15

120:x = 15 * 2
x = 120: 30
x= 4

proba 
120:4:2=15

sau 

(9, 25 + 20, 75) :2 = 15
1 4 1