1.当x=2时,7*2-4y-12=0,y=f(2)=1/2 所以f(2)=2a-b/2=1/2.(1) f'(x)=a+b/x^2 f'(2)=a+b/4=7/4.(2) 解得:a=1,b=3 所以f(x)=x-3/x 2
设函数f(x)=ax-b/x,曲线y=f(x)在(2,f(2))处的切线方程为7x-4y-12=0.
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