a^2-6b^2-ab=a^2-ab-6b^2=(a-3b)(a+2b)=0 所以a=3b..或者a=-2b 因为ab>0,所以a=3b (a+b)/(b-a)=-2
设ab>0,a^2-6b^2-ab=0,求(a+b)/(b-a)
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