Question

Determinati nr natural "n" stiind ca urmatoarele propozitii sunt adevarate:
3n-2 supra n = 5 supra 2
n supra n+1 = 12 supra 15
Ofer coroana!!

Answer 1

(3n-2)/n=5/2
2(3n-2)=5n
6n-4=5n
6n-5n=4
n=4

n/(n+1)=12/15
15n=12(n+1)
15n=12n+12
15n-12n=12
3n=12
n=12:3
n=4