作业帮3x²y-[2xyz-(2xyz-x²yz)+3x²y],其中x=-4,y=1/2,z=3
来源：学生作业帮助网 编辑：作业帮 时间：2024/10/03 23:47:24
![3x²y-[2xyz-(2xyz-x²yz)+3x²y],其中x=-4,y=1/2,z=3](/uploads/image/z/1628434-10-4.jpg?t=3x%26%23178%3By-%5B2xyz-%282xyz-x%26%23178%3Byz%29%2B3x%26%23178%3By%5D%2C%E5%85%B6%E4%B8%ADx%3D-4%2Cy%3D1%2F2%2Cz%3D3)
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3x²y-[2xyz-(2xyz-x²yz)+3x²y],其中x=-4,y=1/2,z=3
3x²y-[2xyz-(2xyz-x²yz)+3x²y],其中x=-4,y=1/2,z=3
3x²y-[2xyz-(2xyz-x²yz)+3x²y],其中x=-4,y=1/2,z=3
3x²y-[2xyz-(2xyz-x²yz)+3x²y]
=3x²y-[2xyz-2xyz+x²yz+3x²y]
=3x²y-x²yz-3x²y
=-x²yz
代入：
原式=-（-4)²×1/2×3
=-16×1/2×3
=-8×3
=-24