30.000.000.000x12.300.050.111+21.000.111-(27:2)=

498152029500000000000

Пошаговое объяснение:

1)30.000.000.000x12.300.050.111= 36900150333000000000

2)36900150333000000000+21000=36900150333000021000

3)27/2=13,5

4)36900150333000021000*13,5=498152029500000000000.