合并同类项1/4x^2y-3x^2+3/4x^2y+2x^2-3x^2y+2x^2y+3xy^2-2xy^2
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合并同类项1/4x^2y-3x^2+3/4x^2y+2x^2-3x^2y+2x^2y+3xy^2-2xy^2合并同类项1/4x^2y-3x^2+3/4x^2y+2x^2-3x^2y+2x^2y+3xy
合并同类项1/4x^2y-3x^2+3/4x^2y+2x^2-3x^2y+2x^2y+3xy^2-2xy^2
合并同类项1/4x^2y-3x^2+3/4x^2y+2x^2
-3x^2y+2x^2y+3xy^2-2xy^2
合并同类项1/4x^2y-3x^2+3/4x^2y+2x^2-3x^2y+2x^2y+3xy^2-2xy^2
-3x^2y+2x^2y+3xy^2-2xy^2=-x^2y+3xy^2
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=-x^2y+xy^2
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