3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)],计算步骤是什么急,
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3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)],计算步骤是什么急,3x²y+xy²-[2xy²
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)],计算步骤是什么急,
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)],计算步骤是什么
急,
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)],计算步骤是什么急,
原式=3x²y+xy²-2xy²+4x²y-x²y+2xy²
=3x²y+4²y-x²y+xy²-2xy²+2xy²
=6x²y+xy²
=xy(6x+y)