3x^2y-[2x^2y-(2xyz-x^2y)-4x^2z-xyz],其中x=-2,y=-3,z=1
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3x^2y-[2x^2y-(2xyz-x^2y)-4x^2z-xyz],其中x=-2,y=-3,z=1
先化简,再求值.
先化简,再求值.
![3x^2y-[2x^2y-(2xyz-x^2y)-4x^2z-xyz],其中x=-2,y=-3,z=1](/uploads/image/z/16871556-12-6.jpg?t=3x%5E2y-%5B2x%5E2y-%282xyz-x%5E2y%29-4x%5E2z-xyz%5D%2C%E5%85%B6%E4%B8%ADx%3D-2%2Cy%3D-3%2Cz%3D1)
3x^2y-[2x^2y-(2xyz-x^2y)-4x^2z-xyz]
=3x^2y-(2x^2y-2xyz+x^2y-4x^2z-xyz)
=3x^2y-2x^2y+2xyz-x^2y+4x^2z+xyz
=3x^2y-2x^2y-x^2y+2xyz+xyz+4x^2z
=3xyz+4x^2z
=3×(-2)×(-3)×1+4×(-2)^2×1
=18+16
=34
=3x^2y-(2x^2y-2xyz+x^2y-4x^2z-xyz)
=3x^2y-2x^2y+2xyz-x^2y+4x^2z+xyz
=3x^2y-2x^2y-x^2y+2xyz+xyz+4x^2z
=3xyz+4x^2z
=3×(-2)×(-3)×1+4×(-2)^2×1
=18+16
=34
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