Va rog repedeva rog

Răspuns:
a) = 2·[27·16:3(4+12)]-18=
2·(432:3:16)-18=
2·9-18=0
b) = [(4·7·2:14-27:27):1+4]·6-36=
[ (4-1):1+4]·6-36=
7·6-36=42-36=6
c) = 400:[210-( 90-9·8·15:12):125·4+190 ]·12=
400:[210-(90-1080:12):125·4+190]·12=
400:(210-0+190)·12=
400:400·12=12