3x²y－﹛x²z－[3x²y＋﹙﹣xyz﹚－3x²z]﹜

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3x²y－﹛x²z－[3x²y＋﹙﹣xyz﹚－3x²z]﹜3x²y－﹛x²z－[3x²y＋﹙﹣xyz﹚－3x²z]﹜3x

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