3x-4y =5 ,xy=3 , find:27x3 -64y3
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27x^3-64x^3=(3x-4y)^3+3(3x)(4y)(3x-3y)
=5^3+36×3×5
=125+108×5
=665
=5^3+36×3×5
=125+108×5
=665
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