factorise 27a³+36a²b+12ab²
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27a3 + 8b3 - 18 a2b - 12 ab2
27a3 + 8b3 - 18 a2b - 12 ab2= (3a )^3 +( 2b) ^3 - (3a)^2× 2b - 3a × (2b)^2
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