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factorise : 27y³+125z³
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27y³ + 125z³
(3y)³ + (5z)³ [ a³+b³ = (a+b)(a²-ab+b²)]
(3y+5z)[(3y)²-(3y5z)+(5z)²]
(3y+5z)[9y²-15yz+25z²]
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