已知a=1/3-2根号2=3+2√2,b=1/3+2根号2=3-2√2;,
b/a+a/b-2
=（b²+a²-2ab）/(ab)
=(a-b)²/(ab)
=(3+2√2-3+2√2)²/(9-8)
=16×2
=32;
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