Решение:
1) (53*48 + 36*48 + 11*48 = (53 + 36 + 11)*48 = 100*48 = 4800)
2) (27*15 - 27*13 + 19*27 = 27*(15 - 13 + 19) = 27*21 = 567)
3) (16*32 - 20*16 + 38*16 = 16*(32 - 20 + 38) = 16*50 = 800)
4) (11*18 + 18*23 - 34*18 = 18*(11 + 23 - 34) = 18*0 = 0)