Question

Helppp!!!!!!!!!dau coroana​

Answer 1

Răspuns:

39

Explicație pas cu pas:

12,(5)=(125-12)/9=113/9

9,(6)=(96-9)/9=85/9

20+1/3=(20*3+1)/3=(60+1)/3=61/3

fie x numarul necunoscut

(113/9+85/9+x)/3=61/3  | *3

113/9+85/9+x=61 | *9

113+85+9*x=549

198+9*x=549 | -198

9*x=549-198

9*x=351 | /9

x=39