问题标题:
急!求-(x-y+z)-2(x-y+z)-3(x-y+z)的值,其中x=2,y=-1z=3
问题描述:

急!求-(x-y+z)-2(x-y+z)-3(x-y+z)的值,其中x=2,y=-1z=3

郭功兵回答:
  -(x-y+z)-2(x-y+z)-3(x-y+z)   =-x+y-z-2x+2y-2z-3x+3y-3z   =-6x+6y-6z   =-12-6-18   =-36   如果不懂,祝学习愉快!
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