化简:—(—3x-y+2x)-{-x+[4x-(x-y-z)-3x]+2z}(用由里向外去括号与由外向里去括号2

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化简:—(—3x-y+2x)-{-x+[4x-(x-y-z)-3x]+2z}(用由里向外去括号与由外向里去括号2

x-y+z

由里向外去括号:原式=-(-x-y)-[-x+(4x-x+y+z-3x)+2z]=x+y-(-x+y+z+2z)=x+y+x-y-3z=2x-3z由外向里去括号:原式=-(-x-y)+x-[4x-(x-y-z)-3x]-2z=x+y+x-4x+(x-y-z)+3x-2z=2x+y-4x+x-y-z+3x-2z=2x-3z你的问题没写完,不...