两道数学分式题~球解答(x-8)/(x-9)-(x-7)/(x-8)-(x-5)/(x-6)+(x-4)/(x-5)xyz=1求x/(xy+x+1)+y/(yz+y+1)+z/(zx+z+1)值在线等球解答啊~

Question

两道数学分式题~球解答
(x-8)/(x-9)-(x-7)/(x-8)-(x-5)/(x-6)+(x-4)/(x-5)
xyz=1 求 x/(xy+x+1)+y/(yz+y+1)+z/(zx+z+1)值
在线等球解答啊~

Answer 1

(x-8)/(x-9)-(x-7)/(x-8)-(x-5)/(x-6)+(x-4)/(x-5)=(x-9+1)/(x-9)-(x-8+1)/(x-8)-(x-6+1)/(x-6)+(x-5+1)/(x-5)=1+1/(x-9)-1-1/(x-8)--1-1/(x-6)+1+1/(x-5)=1/(x-9)-1/(x-8)-1/(x-6)+1/(x-5)=1/(x-9)-1/(x-8)+1/(x-5)...