-x^2y+5xy^2-yx^2合并同类项

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-x^2y+5xy^2-yx^2合并同类项-x^2y+5xy^2-yx^2合并同类项-x^2y+5xy^2-yx^2合并同类项-x^2y+5xy^2-yx^2=-2x^2y+5xy^2

-x^2y+5xy^2-yx^2合并同类项
-x^2y+5xy^2-yx^2合并同类项

-x^2y+5xy^2-yx^2合并同类项
-x^2y+5xy^2-yx^2
=-2x^2y+5xy^2