a/b=3/2,a/(a+b)+b/(a-b)-b的平方/(a的平方-b的平方)等于几过程

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a/b=3/2
a=3b/2
a/(a+b)+b/(a-b)-b的平方/(a的平方-b的平方)
=3b/2/(3b/2+b)+b/(3b/2-b)-b²/(9b²/4-b²)
=3b/2/(5b/2)+b/(b/2)-b²/(5b²/4)
=3/5+2-4/5
=2-1/5
=9/5