己知a-b/a十b=3,则2(a十b)/a-b-4(a-b)/3(a+b)=

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2(a十b)/a-b-4(a-b)/3(a+b)
=2*1/[(a-b)/(a+b)]-4/3*[(a-b)/(a+b)]
=2*3-4/3*3
=6-4
=2
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