factorize =1) a³+27
2) a³-0.216
3)8x³+27y³+z³-18xyz
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1)a³ +27
=(a)³ +(3)³
2)a³-0.216
=(a)³-(0.6)³
3)8x³+27y³+z³-18xyz
=(-2x)³+(-3y)³+(-z)³+2(-2x)(-3y)(-z)
=(-2x-3y-z)³
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