2x²y＋｛2xy-[x²y-2(﹣3x²y+xy)]﹣4xy²｝ 计算

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2x²y＋｛2xy-[x²y-2(﹣3x²y+xy)]﹣4xy²｝ 计算
2x²y＋｛2xy-[x²y-2(﹣3x²y+xy)]﹣4xy²｝ 计算

2x²y＋｛2xy-[x²y-2(﹣3x²y+xy)]﹣4xy²｝ 计算