3x^2y-3xy^2+6yx^2-9y^2x
1个回答
3x^2y-3xy^2+6yx^2-9y^2x
=3x^2y+6yx^2-3xy^2-9y^2x
=9x^2y-12xy^2
=3xy(3x-4y)
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