题目

Holiday visitors to Waikiki Beach, Hawaii, may do a double look at the four-legged surfer riding into shore, but the regulars are always calm. They know the eight-year-old pug is Bugsy, a local star whose owner, David Yew, taught the dog to surf. Yew, 39, got the idea while he and Bugsy were walking on the beach and came upon a statue of a surfer. Yew put the dog down on the surfboard to take a photo, and the scene looked so natural that Yew was inspired to take the next step. Soon enough, the two were together surfing. “The first time we paddled out, ”Yew says, “Bugsy ran righ（本小题满分12分） 已知定义在正实数集上的函数，其中。设两曲线有公共点，且在公共点处的切线相同。 （1）若，求的值；     （2）用表示，并求的最大值。