作业帮3x²y－﹛x²z－[3x²y＋﹙﹣xyz﹚－3x²z]﹜
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/29 10:43:06
![3x²y－﹛x²z－[3x²y＋﹙﹣xyz﹚－3x²z]﹜](/uploads/image/z/6966789-69-9.jpg?t=3x%26%23178%3By%EF%BC%8D%EF%B9%9Bx%26%23178%3Bz%EF%BC%8D%5B3x%26%23178%3By%EF%BC%8B%EF%B9%99%EF%B9%A3xyz%EF%B9%9A%EF%BC%8D3x%26%23178%3Bz%5D%EF%B9%9C)
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3x²y－﹛x²z－[3x²y＋﹙﹣xyz﹚－3x²z]﹜
3x²y－﹛x²z－[3x²y＋﹙﹣xyz﹚－3x²z]﹜
3x²y－﹛x²z－[3x²y＋﹙﹣xyz﹚－3x²z]﹜
解
3x²y-{x²z-[3x²y+(-xyz)-3x²z]}
=3x²y-[x²z-(3x²y-xyz-3x²z)]
=3x²y-(x²z-3x²y+xyz+3x²z)
=3x²y-(4x²z-3x²y+xyz)
=3x²y-4x²z+3x²y-xyz
=6x²y-4x²z-xyz