Ответ:−m⁴(−5m³n²)⁴ = −m⁴·625m¹²n⁸ = −625m¹⁶n⁸.(−2x³y⁴)⁵ = (−2)⁵x¹⁵y²⁰ = −32x¹⁵y²⁰.4a³b·5a⁶b⁴ = (4·5)a⁽³⁺⁶⁾b⁽¹⁺⁴⁾ = 20a⁹b⁵.