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Verified answer
(56m³n⁶r⁴ : 7m²n⁵r²) ³ = ((56:7)(m³:m²)(n⁶:n⁵)(r⁴:r²))³= (8.m³⁻².n⁶⁻⁵.r⁴⁻²)³
= (8.m¹.n¹.r²)³
= 512m³n³r⁶