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I)27a^3+8b^3+54a^2b+36ab^2 =(3a)^3+(2b)^3+3×(3a)^2×2b+3×3a×(2b)^2 =(3a+4b)^3 ii)8x^3+64 =(2x)^3+4^3 =(2x+4){(2x)^2-2x×4+4^2} =(2x+4)(4x^2-8x+16)
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