化简 x²y-3xy²+2yx²-y²x
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化简x²y-3xy²+2yx²-y²x化简x²y-3xy²+2yx²-y²x化简x²y-3xy²+2
化简 x²y-3xy²+2yx²-y²x
化简 x²y-3xy²+2yx²-y²x
化简 x²y-3xy²+2yx²-y²x
原式=（1+2）x^2y+(-3-1)xY^2
=3x^2y-4xy^2
x²y-3xy²+2yx²-y²x
=（1+2）x²y-(3+1)xy²
=3x²y-4xy²