x²y-3xy²+2yx²-y²x,急用!

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x²y-3xy²+2yx²-y²x,急用!x²y-3xy²+2yx²-y²x,急用!x²y-3xy²

x²y-3xy²+2yx²-y²x,急用!
x²y-3xy²+2yx²-y²x,急用!

x²y-3xy²+2yx²-y²x,急用!