22题.
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22题.
22题.
22题.
(a+b)=a+b+2ab=1
a+b=7
(a+b)/ab=1/a+1/b=1/3
(1/a+1/b)(a+b)=-1/3
a/b+b/a=-7/3
(a-2)(b-2)=ab-2(a+b)+4=3