1) 4 704 - 4704 : (46 + 38) = 4704 - 4704 : 84 = 4704 - 56 = 4648
2) 2 808 : 72 + 15808 : 52 = 39 + 304 = 343
3) (256 + 144): 16 - 8 = 400 : 16 - 8 = 25 - 8 = 17
4) 256 + 144 : (16 – 8) = 256 + 144 : 8 = 256 + 18 = 274