合并多项式:-p²-p²-p²- -3x²y+2x²y+3xy²-2xy²

问题描述:

合并多项式:-p²-p²-p²- -3x²y+2x²y+3xy²-2xy²

-p²-p²-p²- -3x²y+2x²y+3xy²-2xy²
=-3p²