Dear landlord: The first question is a power set, which is a set composed of subsets in the set, so the answer is {empty, {empty}, {empty, {empty}} The second question is about the binary relationship between sets, because y=2*x is based on elements in A and B, only x=3 and x=4 can satisfy the conditions, and the corresponding ordered pairs are.

The answer to question 8 is q->; P It's like because he goes to work by bus, so it only rains heavily, which is equivalent to him going to work by bus only when it rains heavily. The true value of question 8 is 1, and all four logical variables are brought in.