原帖由 [S]【YU】 於 30-11-2008 20:13 發表
1.)find domain and range of g(x)=(x^2-1)/(x^2-3x+2)=(x-1)/(x-2) = 1 + 1/(x-2)
domain = all real number exclude 2
range = all real number exclude 1
貌似...
g(x)=(x^2-1)/(x^2-3x+2)={(x+1)(x-1)}/{(x-2)(x-1)} --> (x+1)/(x-2) = 1 + {3/(x-2)}
isn't g(x) undefined at x=1 and x=2 ?