化简计算(式中a,b,c两两不相等):2a−b−ca2−ab−ac+bc+2b−c−ab2−ab−bc+ac+2c−a−bc2−ac−bc+ab
问题描述:
化简计算(式中a,b,c两两不相等):
+2a−b−c
a2−ab−ac+bc
+2b−c−a
b2−ab−bc+ac
2c−a−b
c2−ac−bc+ab
答
原式=
+(a−b)+(a−c) (a−b)(a−c)
+(b−c)+(b−a) (b−c)(b−a)
(c−a)+(c−b) (c−a)(c−b)
=
+1 a−c
+1 a−b
+1 b−a
+1 b−c
+1 c−b
=0.1 c−a