1) Because there is a point x=- 1 in set B, and set A doesn't, it is impossible to evaluate a? B: I wonder if you wrote it.

Error)

2)A={x|x=t？ -2t-3 & gt； =-4}，B={y|y=2x？ -8x+4 & gt； =-4},

So A∩B=A∪B=[-4,+∞).

3) This question is given a number. Just list the intersection and union of each term, without your theoretical proof.

I don't know which one is better online, but I'd better recommend some books to you.

One lesson and one practice, reading and doing problems, the five-star question bank published by China Normal University, which was relied on by high schools in those days, I hope it will help you.