合并多项式:-p²-p²-p²- -3x²y+2x²y+3xy²-2xy²
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合并多项式:-p²-p²-p²- -3x²y+2x²y+3xy²-2xy²
合并多项式:-p²-p²-p²- -3x²y+2x²y+3xy²-2xy²
合并多项式:-p²-p²-p²- -3x²y+2x²y+3xy²-2xy²
-p²-p²-p²- -3x²y+2x²y+3xy²-2xy²
=-3p²
-3p²+x²y+xy²