Answer
$3x^{2m}y^{m}( x^m- 2y^{m})$
Work Step by Step
$3x^{3m}y^{m}-6x^{2m}y^{2m}=\\=3x^{2m}y^{m}\cdot x^m+3x^{2m}y^{m}\cdot (-2y^m)\\=3x^{2m}y^{m}( x^m- 2y^{m})$
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