¼x³y²·﹙﹣2xy²﹚+﹙-2x²y﹚·﹙-½xy﹚·3xyz
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¼x³y²·﹙﹣2xy²﹚+﹙-2x²y﹚·﹙-½xy﹚·3xyz
¼x³y²·﹙﹣2xy²﹚+﹙-2x²y﹚·﹙-½xy﹚·3xyz
¼x³y²·﹙﹣2xy²﹚+﹙-2x²y﹚·﹙-½xy﹚·3xyz
¼x³y²·﹙﹣2xy²﹚+﹙-2x²y﹚·﹙-½xy﹚·3xyz
=-½x^4y^4+3x^4y³z
¼x³y²·﹙﹣2xy²﹚+﹙-2x²y﹚·﹙-½xy﹚·3xyz
¼x³y²·﹙﹣2xy²﹚+﹙-2x²y﹚·﹙-½xy﹚·3xyz
¼x³y²·﹙﹣2xy²﹚+﹙-2x²y﹚·﹙-½xy﹚·3xyz
¼x³y²·﹙﹣2xy²﹚+﹙-2x²y﹚·﹙-½xy﹚·3xyz
=-½x^4y^4+3x^4y³z