Ответ:\(5^4-6^3+254=625-216+254=663\).\(2\cdot5^3-3^3+3\cdot54=250-27+162=385\).\(5\cdot4^3-6^3+3\cdot88=320-216+264=368\).\(2^3\cdot5^2-8^3-4\cdot84=200-512-336=-648\).