(a +b +c) ^2 +(a -b) ^2 +(b -c) ^2 +(c - a)^2
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(a +b +c) ^2 +(a -b) ^2 +(b -c) ^2 +(c - a)^2
(a +b +c) ^2 +(a -b) ^2 +(b -c) ^2 +(c - a)^2
(a +b +c) ^2 +(a -b) ^2 +(b -c) ^2 +(c - a)^2
(a +b +c) ^2 +(a -b) ^2 +(b -c) ^2 +(c - a)^2
=(a +b +c) ^2 +a²-2ab+b²+b²-2bc+c²+c²-2ac+a²
=(a+b)²+2(a+b)c+c²+2a²+2b²+2c²-2ab-2bc-2ac
=a²+2ab+b²+2ac+2bc+c²+2a²+2b²+2c²-2ab-2bc-2ac
=3a²+3b²+3c²
=(a +b +c) ^2 +a²-2ab+b²+b²-2bc+c²+c²-2ac+a²
=(a+b)²+2(a+b)c+c²+2a²+2b²+2c²-2ab-2bc-2ac
=a²+2ab+b²+2ac+2bc+c²+2a²+2b²+2c²-2ab-2bc-2ac
=3a²+3b²+3c²
a、b、c互不相等,则2a-b-c/(a-b)(a-c)+2b-c-a/(b-c)(b-a)+2c-a-b/(c-a)(
行列式证明|b+c c+a a+b| | a b c||a+b b+c c+a| = 2 |c a b||c+a a+b
(a-b)(b-c)(c-a)/(b-a)(a-c)2(c-b)3
计算(a-b)(a-c)/(a+b-2c)(a+c-2b)+(b-c)(b-a)/(b+c-2a)(b+a-2c)+(c
计算a(b+c-a)^2+b(c+a-b)^2+c(a+b-c)^2+(b+c-a)(c+a-b)(a+b-c)
化简:2a-b-c/(a-b)(a-c) + 2b-a-c/(b-c)(b-a) + 2c-a-b/(c-b)(c-a)
化简(2a-b-c)/(a+b)(a-c)+(2b-c-a)/(b-c)(b-a)+(2c-a-b)/(c-b)(c-a
初二分式的加减法2a-b-c/(a-b)(a-c)+ 2b-c-a/(b-c)(b-a)+ 2c-b-a/(c-b)(c
化简:(2a-b-c)/(a-b)(a-c)+(2b-c-a)/(b-c)(b-a)+(2c-a-b)/(c-a)(c-
|a-b|+|a+c|-|b-c|+|2c|
|a-b|+|a+c|-|b-c|+|2c|怎么化简啊?
化简:|a|+|-b|-|c|;(2) |a-c|+|b+c|.