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/87Find the value of 64 x 125y, if 4 x 5y 16 and xy 12.

Answer»

64x³ - 125y³ = (4x-5y)³ + 3(4x)(5y)(4x-5y)= (16)³ + 3(4)(5)(12)(16)= 4096 + 11520= 15616.

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