Virtual currency tree

2. Fake, game, just a cover used by swindlers to cheat money, next time it may be in other forms. For us, the most important thing is to identify deception and stop being cheated
in December 2016, the official website of the Ministry of culture published the notice of the Ministry of culture on standardizing the operation of online games and strengthening the supervision ring and after the event, in which Article 9 clearly states that "online game operation enterprises shall not provide users with the service of virtual currency exchange for legal currency or real object of online games"
many people who take part in the tree planting game have a playful attitude at the beginning, but greed makes them fall deeper and deeper.

3. Fake, game, that's just a cover used by swindlers to cheat money. Next time, it may be in other forms. For us, the most important thing is to identify deception and stop being cheated< In December 2016, the official website of the Ministry of culture published the notice of the Ministry of culture on standardizing the operation of online games and strengthening the supervision ring and after the event, in which Article 9 clearly states that "online game operation enterprises shall not provide users with the service of exchanging virtual currency of online games for legal currency or physical objects"

many people who take part in the tree planting game have a playful attitude at the beginning, but greed makes them fall deeper and deeper.

4. If it is mandatory, it will become a levy. If it is just a call or advocacy, you can refuse. Of course, the consequences of refusal are hard to say. There are differences in local policies. This is the current situation in China! Although you can say that he is illegal, but there is no way to plead.

5. (1) Y = 90 (21-x) + 70X = - 20x + 1890,
so the answer is: y = - 20x + 1890
(2) ∵ the number of seedlings of species B was less than that of species a,
∵ X & lt; 21-x,
solution: X & lt; 5,
and ∵ x ≥ 1,
the value range of ∵ x is: 1 ≤ x ≤ 10, and X is an integer,
∵ y = - 20x + 1890, k = - 20 & lt; When x = 10, y has a minimum value of - 20 × 10 + 1890 = 1690,
the most cost saving plan is to buy 10 seedlings of species B and 11 seedlings of species a, and the cost is 1690 yuan

6. If offline and CBG trading department will be too frequent, it will not be called. You can't plant more trees by yourself

7. A set of 3 commemorative coins for tree planting day in 1991, worth 30 to 40 yuan.

8. All three! 10-15 yuan per piece!

10.

Hello! At present, the market price of the new rolled and disassembled original procts is about 25 yuan. According to your personal estimation, the market price of this coin is about 5-6 yuan, for reference only

On March 2, 1991, the people's Bank of China issued a set of three ordinary circulating commemorative coins with a face value of 1 yuan and a circulation of 10 million sets to celebrate the 10th anniversary of compulsory tree planting