以知f(x)=(ax+b)/(cx+d)(c不等于0且AD不等于BC),如果f(x)和其反函数是同一函数,求证a=-d
人气：241 ℃ 时间：2019-08-21 00:44:53
解答
设y=(ax+b)/(cx+d)解出x=(b-yd)/(cy-a)即y=(b-xd)/(cx-a)两函数为同一函数解得a=-d
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