Răspuns:
1. n/8 = 2/n => n×n = 8×2 n^2 = 16 n =√16 = 4
2. n-1 / n+2 = 2/3 =>( n-1 )× 3 = ( n+2)×2
3n-3 = 2n + 4 3n-2n = 4+3 => n= 7
3. 5/ n+3 = 4/ n-1 5×(n-1) = (n+3)×4
5n - 5 = 4n + 12 5n - 4n = 12 +5 n = 17
4. n-4 / 2 = n+2 / 4 (n-4) × 4 = (n+2)×2
4n -16 = 2n + 4 4n-2n = 4+16 2n= 20
n= 20:2 = 10
