Question

求函数f（x）=根号下9-x^2+lg（x^2-3x+2）的定义域

Answer 1

9-x^2≥0 (3-x)(3+x)≥0,-3≤x≤3

x^2-3x+2>0 (x-2)(x-!)>0,x2

综上,{x▏-3≤x