prin operatii urgent dau coroana
![Prin Operatii Urgent Dau Coroana class=](https://ro-static.z-dn.net/files/d09/3fc059f1a3c2c9ff836ea497d196c57f.jpg)
Explicație pas cu pas:
(12^2-11^2):1^20
(144-121):1
23:1
23