6x²y+2yx²-4x²y=

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6x²y+2yx²-4x²y=

6x²y+2yx²-4x²y=
6x²y+2yx²-4x²y=

6x²y+2yx²-4x²y=
6x²y+2yx²-4x²y
=4x²y

6x²y+2yx²-4x²y=2x²y+2yx²=2xy*（x+y）

答案是4x²y