Question

解分式方程 快快快

2/(x+y)-1/(x-y)=7
1/(x+y)+1/(x-y)=-1
谢谢

Answer 1

2/(x+y)-1/(x-y)=7 (1)
1/(x+y)+1/(x-y)=-1 (2)
(1)+(2)
3/(x+y)=6
所以
x+y=1/2 (3)
x-y=1/[2/(x+y)-7]=-1/3 (4)
(3)+(4)
2x=1/6
所以
x=1/12
y=1/2-x=5/12

Answer 2

3/x-2+x/2-x=-2
解：方程两边同乘2x,得：
6-4x+x^2-2x^2=-4x
x^2=6
x=√6
是否可以解决您的问题？

Answer 3

x1/12 y5/12