3X^2y-{xyz-(2xyz-9x^2z+4x^2z)+[3x^2y+(4xyz-5x^2z-3xyz)]}=3x^2y-xyz+2xyz-9x^2z+4x^2z+3x^2y+4xyz-5x^2z-3xyz=3x^2y+3x^2y-xyz+2xyz+4xyz-3xyz-9x^2z+4x^2z-5x^2z=6x^2y+2xyz-10x^2z
化简3X^2y-{xyz-(2xyz-9x^2z+4x^2z)+[3x^2y+(4xyz-5x^2z-3xyz)]}等于
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