因式分解:1/27-x+9x²-27x³ 下午2点前回答追加分还有一题:6x²-7xy-20y²
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![因式分解:1/27-x+9x²-27x³ 下午2点前回答追加分还有一题:6x²-7xy-20y²](/uploads/image/z/342798-6-8.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%9A1%2F27-x%2B9x%26%23178%3B-27x%26%23179%3B+%E4%B8%8B%E5%8D%882%E7%82%B9%E5%89%8D%E5%9B%9E%E7%AD%94%E8%BF%BD%E5%8A%A0%E5%88%86%E8%BF%98%E6%9C%89%E4%B8%80%E9%A2%98%EF%BC%9A6x%26%23178%3B-7xy-20y%26%23178%3B)
因式分解:1/27-x+9x²-27x³ 下午2点前回答追加分还有一题:6x²-7xy-20y²
因式分解:1/27-x+9x²-27x³ 下午2点前回答追加分
还有一题:6x²-7xy-20y²
因式分解:1/27-x+9x²-27x³ 下午2点前回答追加分还有一题:6x²-7xy-20y²
1/27-x+9x²-27x³
=1/27-x+6x²+3x²-27x³
=﹙3x-1/3﹚﹙2x-1/9﹚-9x²﹙3x-1/3﹚
=﹙3x-1/3﹚﹙2x-1/9-9x²﹚
=﹙3x-1/3﹚[﹣﹙3x-1/3﹚²]
=﹣﹙3x-1/3﹚³
6x²-7xy-20y²=﹙3x+4y﹚﹙2x-5y﹚