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Why is there only one fish left when the bear touches the fish?
Because the bear moved and the fish under his ass didn't move, there was only one fish under his ass.

Math Story 1

This morning, when I woke up, my parents were really nice. Then I said, "Good morning, Mom and Dad." My parents immediately gave me a red envelope, my father gave me 200 yuan, and my mother gave me 1000 yuan. After I hid the red envelope, we went to the kitchen.

In the kitchen, I saw my grandpa, grandma and uncle. I just want to say "good morning, grandpa, grandma, uncle". Grandpa, grandma and uncle gave me a red envelope directly, grandpa gave me 300, grandma gave me 500, and uncle?

I gave 500 yuan like my grandmother, and now I have collected a few dollars.

200+1000+300+500+500 = 2500 (yuan), so now I have received 2500 yuan. Over the years, I have received more red envelopes than last year. I am very excited. I thank my elders for giving me a red envelope and Teacher Zhu for teaching me math, so I want to learn math.

Mathematical story II

What's the use of mathematics? Boring figures and coincidental topic design seem to be far from real life. In fact, to make mathematics useful, the limitation lies not in mathematics itself, but in its users. Let's see how math users who are diligent in thinking and brave in practice make math play a role everywhere in their lives.

In today's online games, there is a kind of "magical mind-reading handed down by Gypsies". It is said that you can measure your inner feelings. The game is like this: choose a two-digit number at will (in other words, choose a number from 10 ~ 99 at will), add the ten digits of this number to this one digit, and then subtract this sum from the randomly selected number.

For example, if you choose 23, then 2+3=5, and then 23-5= 18. Find the number corresponding to the final number in the game diagram, remember this number, and then click the crystal ball on the webpage.

You will find that the figure displayed in the crystal ball is the one you just remembered in your mind. The crystal ball makes you feel magically how it reads your mind! Have you ever played this game? What is the reason?