-7 x²y-5 x y²-4 x²+3 x y²谢谢合并同类项

-7 x²y-5 x y²-4 x²+3 x y²谢谢合并同类项
-7 x²y-5 x y²-4 x²+3 x y²
谢谢
合并同类项

-7 x²y-5 x y²-4 x²+3 x y²谢谢合并同类项

-7 x²y-5 x y²-4 x²+3 x y²
=-7 x²y+3 x y²-5 x y²-4 x²
=-7x²y-2xy²-4x²

-7 x²y-5 x y²-4 x²+3 x y²
=-7x^2y-2xy^2-4x^2
=-x(7xy+2y^2+4x)