首先g(x+2)=f(x)所以设x + 2 = t,则g(t) = f(t-2) = 2(t-2) + 3 = 2t - 1最后把t换成x就行,即2（x+2）-1然后g（x-2）=f（x）g(x-2)=f(x)=2x＋3=2(x-2)＋7所以g(x)=2x＋7-------------------------------------------...