Factorise :
125x³+8y³ + z³ – 30 xyz
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(5x)³+(2y)³+(z)³-30xyz
(5x+2y+z)[(5x)²+(2y)²+(z)²-(5x×2y)-
(2y×z)-(5x×z)]
(5x+2y+z)(25x²+4y²+z² -10xy - 2yz- 5xz)
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