Factorise 1/64a³+b³+125c³_15/4abc
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1/64a^3+b^3+125c^3-15/4abc
=(1/4a)^3+b^3+(5c)^3-3.1/4a.b.5c
=(1/4a+b+5c)(1/16a^2+b^2+25c^2-1/4ab-5bc-5/4ca)
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