(x+y-z)-(x-y+z)-(x-y-z)去括号合并同类项

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(x+y-z)-(x-y+z)-(x-y-z)去括号合并同类项(x+y-z)-(x-y+z)-(x-y-z)去括号合并同类项(x+y-z)-(x-y+z)-(x-y-z)去括号合并同类项(x+y-z)

(x+y-z)-(x-y+z)-(x-y-z)去括号合并同类项
(x+y-z)-(x-y+z)-(x-y-z)去括号合并同类项

(x+y-z)-(x-y+z)-(x-y-z)去括号合并同类项
(x+y-z)-(x-y+z)-(x-y-z)
原式=x+y-z-x+y-z-x+y+z
=-x+3y-z