-2x²y(-2xy²)²+(2xy)³·(xy²)＝-8x²y(xy²)²+8(xy)³·(xy²)＝－8x²y(x²y＾4）+8(x³y³）·(xy²)－8x＾4y＾5＋8x＾4y＾5＝0