2a²+ab-b²=0
a≠0
则2+b/a-(b/a)²=0
(b/a-2)(b/a+1)=0
b/a=2或-1
a/b-b/a-(a²+b²)/(ab)
=(a²-b²-(a²+b²))/(ab)
=-2b/a
=-4或2
如果认为讲解不够清楚,