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)]﹣4x
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
(4-5x-4y)xy