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Ответ:

Формула кубa суммы:   [tex](a+b)^3=a^3+3a^2b+3ab^2+b^3[/tex]  .

[tex](0,5m^2+n^4)^3=(0,5m^2)^3+3\cdot (0,5m^2)^2\cdot n^4+3\cdot (0,5m^2)\cdot (n^4)^2+(n^4)^3=\\\\\\=0,125m^6+0,75m^4n^4+1,5m^3n^8+n^{12}[/tex]