3a²+ab-2b²=0
(3a-2b)(a+b)=0
3a-2b=0,a/b=2/3
a+b=0,a/b=-1
∴b/a-a/b-(a²-b²)/ab
=(b²-a²)/ab-(a²-b¹)/ab
=-2a/b
①当a/b=2/3时,原式=-2/3;
②当a/b=-1时,原式=1.
3a²+ab-2b²=0
(3a-2b)(a+b)=0
3a-2b=0,a/b=2/3
a+b=0,a/b=-1
∴b/a-a/b-(a²-b²)/ab
=(b²-a²)/ab-(a²-b¹)/ab
=-2a/b
①当a/b=2/3时,原式=-2/3;
②当a/b=-1时,原式=1.