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化简求值:x²y-[-x²y+(xyz-x²z)+xyz]-x²z,其中x=﹣1,y=﹣2
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化简求值:x²y-[-x²y+(xyz-x²z)+xyz]-x²z,其中x=﹣1,y=﹣2
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x²y-[-x²y+(xyz-x²z)+xyz]-x²z=x²y-(-x²y+xyz-x²z+xyz)-x²z=x²y+x²y-xyz+x²z-xyz)-x²z=2x²y-2xyz=2*1*(-2)-2*(-1)*(-2)*z=-4-4z
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