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x+yx-y+z+x+zy-x-z-y+zz+x-y.

题目详情
x+y
x-y+z
+
x+z
y-x-z
-
y+z
z+x-y
▼优质解答
答案和解析
原式=
x+y
x-y+z
-
x+z
x-y+z
-
y+z
x-y+z

=
x+y-x-z-y-z
x-y+z

=-
2z
x-y+z