(x+y-z)-(x-y+z)-(x-y-z)去括号合并同类-查字典问答网
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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

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2020-07-1517:31
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段浩

  (x+y-z)-(x-y+z)-(x-y-z)

  原式=x+y-z-x+y-z-x+y+z

  =-x+3y-z

2020-07-15 17:32:51
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