1. It is known that a, B and C are not equal to each other Find 2a-b-c / (a-b) (B-C) + 2b-c-a / (B-C) (B-A) + 2c-a-b / (C-A) (C-B) =? (/ is a fractional line) 2. It is known that 1 / A + 1 / B + 1 / C is not equal to 0 The solution equation is: x-a-b / C + x-b-c / A + x-c-a / B + 3 It's better to be careful I'm very sorry. I missed it~ x-a-b/c+x-b-c/a+x-c-a/b+3=3

1. It is known that a, B and C are not equal to each other Find 2a-b-c / (a-b) (B-C) + 2b-c-a / (B-C) (B-A) + 2c-a-b / (C-A) (C-B) =? (/ is a fractional line) 2. It is known that 1 / A + 1 / B + 1 / C is not equal to 0 The solution equation is: x-a-b / C + x-b-c / A + x-c-a / B + 3 It's better to be careful I'm very sorry. I missed it~ x-a-b/c+x-b-c/a+x-c-a/b+3=3

1.2a-b-c/(a-b)(b-c)+2b-c-a/(b-c)(b-a)+2c-a-b/(c-a)(c-b)=2a-b-c/(a-b)(b-c)-（2b-c-a）/(b-c)(a-b)+2c-a-b/(c-a)(c-b)=3a-3b/(a-b)(b-c)+2c-a-b/(c-a)(c-b)=3/(b-c)+2c-a-b/(c-a)(c-b)=3/(b-c)+2c-a-b/(a-c)(b-c)...