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(m²+m+1)/(m³-64) - (3m+15)/(64-m³) =

= (m²+m+1)/(m³-64) + (3m+15)/(m³-64) =

= (m²+m+1 + 3m +15)/(m³-64) =

= (m²+4m+16)/(m³-4³) =

= (m²+4m+16)/((m-4)*(m²+4m+16)) =

= 1 / (m-4)

при m=7:

= 1 / (7-4) = 1/3