来自杜庆楠的问题
(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
1回答
2020-07-1517:31
(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