Xiaoyi was sleeping soundly when she was suddenly awakened by a "zero zero" sound. He rolled up and looked out. Oh, it's still dark outside. Did the alarm clock at the bedside ring? No, this "zero zero" sound is very nice. It is obviously coming from outside the house. Listen, it is still ringing.

He got dressed, walked out of the house and followed the sound. Gee, a huge oval palace appeared at the door of the house. The palace was ablaze with lights. The sound of "zero zero" came from the palace. Xiao Yi was visiting him when suddenly a child jumped out. Xiao Yi couldn't help laughing. How strange the child looks. He has a duck egg-shaped head and no hair, just like an Arabic numeral "0".

The child politely said to Xiao Yi, "Welcome to visit our Zero Kingdom."

Xiaoyi couldn't help one leng. Zero kingdom? I have only heard of Britain, France and the United States, but I have never heard of the Zero Kingdom.

Xiaoyi is trying to understand. The child said, "My name is Wang Xiaoling. I'll take you to our king zero. Ok? "

There is a king in Zero Kingdom. Xiaoyi was very curious and walked into the oval door with Wang Xiaoling.

Along the way, everyone Xiaoyi met was Rainbow Xiaoling, duck-headed and hairless. Xiaoyi couldn't help asking, "Wang Xiaoling, why are your heads all bald?"

Wang Xiaoling said with a smile: "We are a zero kingdom here, and all people are zero, so our heads all look like an Arabic numeral 0."

Xiaoyi asked, "Are women bald, too?"

Wang Xiaoling said, "You have men and women, just like other integers, there are positive numbers and negative numbers. There is no such difference in our zero kingdom. All members are zero, and they are not responsible. "

I see. Xiaoyi nodded his head. Wang Xiaoling took him to an oval room and waved and said, "Please visit our dormitory first."

Xiaoyi walked into the dormitory and saw that it was full of bunk beds with upper and lower floors. Many residents of Zero Kingdom rest in the upper bunk, but the lower bunk is empty.

Xiao Yi asked strangely, "Why does everyone sleep in the upper bunk and the lower bunk is empty?"

Wang Xiaoling said: "This double board is a fractional line. We can only rest on the score line. Lying below the score line is a bad thing. Do you know why? "

Xiaoyi wanted to think, and then an epiphany. He said: "I see, this is because in the four operations, zero can't be a divisor or a denominator."

Wang Xiaoling smiled and said, "You're right. If I am the denominator, but the numerator is not in our category, say 2: 2÷0, what will be the result? Let 2 ÷ 0 = a, then 2 = 0× a, because any number multiplied by 0 will get 0, not 2, so this A cannot exist, and the imaginary 2 ÷ 0 is meaningless. If the molecule is our kind, it becomes 0÷0. If the height is 0÷0 ÷ 0=b, then 0 = 0× b, in this formula, b can be any number, and what number is 0 ÷ 0 cannot be determined. Just because zero can't be the denominator, we all have to abide by a rule and can't lie alone under the fractional line. "

They visited the dormitory and came to a magnificent palace. Xiaoyi saw the zero king sitting in the middle of the throne. He looks very old, but he has no beard; Duck's egg-shaped head has no crown.

Xiaoyi bowed to zero king. King Zero said politely, "Welcome to visit our Zero Kingdom. Through this visit, you will have a better understanding of our residents. "

Xiao Yi said, "Yes, Wang Xiaoling just taught me a lot."

King Zero suddenly remembered something and became serious: "But some children don't know enough about our importance and think that zero equals' nothing'. This is a great insult to us! They only know that the Monkey King can play with a magic wand, calling it big and small, but they don't know that we have such magical powers. As long as there is a zero standing on the right side of a positive integer, this integer can be enlarged by 10 times. For example, if a' 0' stands to the right of 4, it will immediately become 40. On the contrary, if you encounter a pure decimal, you can shrink it by 10 times by squeezing a zero after the decimal point, for example, squeezing a' 0' in the middle of 0.5 will become 0.05. We have such great skills, how can we say that it is equal to' no'? "

Xiao Yi thought it was true and said, "So, in some cases, zero is still essential."

King Zero smiled proudly. He said, "Without us, there would be no possibility of developing mathematics. Modern electronic computers use a binary system. Of the ten numbers from 0 to 9, the others are useless, only 1 and our 0 are left. This shows how important our zero is! Now let Wang Xiaoling show you around, but you should pay attention to one thing: you can only shake hands with our residents and never hug them. "

Xiao Yi said strangely, "Why is this?"

King Zero said, "In our place, shaking hands is addition and hugging is multiplication."

Xiao Yi also thought about this problem. The plus sign "+"looks like two clenched hands, and the multiplication sign "×" looks like arms crossed together!

King Zero went on to say, "You shake hands with Zero, that is, you add zero, and the result is still yourself. If you embrace zero, it means that you multiply with zero, and as a result, you become zero, and you can never go home again. Would you like to be a resident of our zero kingdom? " Xiaoyi quickly shook his head and said, "I ... I ..."

Wang Ling smiled and said, "I know you don't want to. Wang Xiaoling, show the guests around and take them home. "

Xiaoyi bowed to zero king again, and then followed Wang Xiaoling out.

They turned a corner and walked into a recreation room. Many residents of Zero Kingdom play games here, some play ball and some play chess. Xiaoyi pressed the seesaw with interest. There is only one zero at one end of the seesaw and seven or eight zeros at the other end, but the weight on both sides is the same. When the seesaw goes up and down, it is very exciting to play.

Xiaoyi asked Wang Xiaoling, "There is only one zero at this end and seven or eight zeros at that end. How can you not suppress it? "

Wang Xiaoling smiled and said, "One zero is zero. Seven or eight zeros add up and the result is still zero. All the residents here have no weight. How can you forget? "

Xiaoyi also plays with them. He sat down at this end of the seesaw and the other end was held high. Even if there are dozens or hundreds of zeros, Xiao Yi can't improve a bit. In the kingdom of zero, Xiao Yi, who weighs only 20 kilograms, became an overweight athlete.

Suddenly, Xiaoyi heard the sound of "zero zero" again. I saw a resident of Zero Kingdom singing and rushing towards Yi with open arms. Wang Xiaoling nervously said to XiaoYi, "is broken, so run. This zero is mental illness. He hugs everyone, hugs everyone. Isn't it a bad thing that you let him hug you? "

Xiaoyi was frightened out of her wits, fearing that she would become zero. Without saying goodbye to Wang Xiaoling, he started to run, even afraid to look back, only to hear the voice of "zero zero" growing behind him. He suddenly tripped over something and fell with a splash. When he rolled over, he was still lying in bed. The alarm clock on the desk rang, so it's time to get up.