若1/a-1/b=1/a+b,求b/a-a/b-3的值?
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若1/a-1/b=1/a+b,求b/a-a/b-3的值?
若1/a-1/b=1/a+b,求b/a-a/b-3的值?
若1/a-1/b=1/a+b,求b/a-a/b-3的值?
1/a-1/b=1/(a+b)
(b-a)/(ab)=1/(a+b)
ab=b²-a²
(b²-a²)/(ab)=1
b/a-a/b-3=(b²-a²)/(ab)-3
=1-3=-2
-2
-2