问题
解答题
化简
|
答案
原式=
+(x-y)+(x-z) (x-y)(x-z)
+(y-x)+(y-z) (y-x)(y-z) (z-x)+(z-y) (z-x)(z-y)
=
+1 x-z
+1 x-y
+1 y-z
+1 y-x
+1 z-y 1 z-x
=
-1 x-z
+1 x-z
-1 x-y
+1 x-y
-1 y-z 1 y-z
=0+0+0
=0．
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