Is it difficult to sell clothes in Wenling shopping center

1.

By brushing the dog, many people now register by hanging instead of using the real name system, and use many accounts to buy low and sell high, deliberately suppress the price of the dog, ince players to sell the dog, and gain points by the price difference

website links

2. First look at the network to see the rules
general points cannot be purchased.

3. According to the definition of definite integral, it is not difficult to find out. This is an area of 1 / 4 circles with radius 2 and center (0,0). Then the answer is 1 / 4 times 2 send

4. ⊙∀ ⊙

5.

as shown in the figure, for reference only

6. Basically not.

7. Unknown_Error

8. ......

9. No, when a new thing is just born, it is inevitable to encounter suspicion and vigilance, and the emergence of blockchain technology is to break this credit asymmetry.