`` `` `` ``
460.220
460.220
$1/8x^2z^3-8x^2y^3=$
$=x^2*(1/2z)^3+x^2*(2y)^3=$
$=x^2*(1/2z+2y)*[(1/2z)^2-zy+(2y)^2]=$
$=x^2*(1/2z+2y)*[(1/4z^2)-zy+4y^2]$
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