已知集合A=[xIy=lg(x+1/x-1)],集合B=[yIy=(x^2/x-1)]试求A交与B,

Question

已知集合A=[xIy=lg(x+1/x-1)],集合B=[yIy=(x^2/x-1)]试求A交与B,

Answer 1

(x+1)/(x-1)>0
∴(x+1)(x-1)>0
∴x>1 or x1 or x0
∴y^2-4y>0
∴y>4 or y4 or y4 or z