Răspuns:
c) {30+10•[207-6•(28+28:7)]}:10-1
{30+10•[207-6•(28+4)]}:10-1
[30+10•(207-192)]:10-1
(30+10•15):10-1
(30+150:10-1
180:10-1
18-1=17 coroana?❤❣