Chen Da's daughter Xiao Gan is in the fifth grade of primary school. On this day, Xiao Gan met a difficult problem of "Olympiad Mathematics". The topic is like this: a bear accidentally fell into a big pit, and the falling speed was 10 meter per second. What color is this bear?
Xiao gan thought for a long time, but he didn't understand what is the relationship between the color of the bear and the speed of falling. So, she honestly wrote "I don't know" in the answer column.
When Chen Da checked her daughter's homework, she was shocked when she saw this question.
Although he graduated from college, he just couldn't see any connection between the color of the bear and the numbers in the title. It's not good for my daughter to fill in the affirmative answer like this. He must find out the correct answer to this question. You know, the last time he helped his daughter check the "Olympic math" problem, he was severely laughed at by his classmates: "Thanks to your father being a middle school teacher." For this matter, my daughter Xiao Gan came back and cried for a long time.
Today, Chen Da doesn't want the same thing to happen again. He teaches Chinese in a middle school, and there is a math teacher among his colleagues, so he sent a message to his colleague Lao Li, a math teacher in Grade Two, and sent this question to Lao Li for help.
Lao Li's short message came soon, and the answer was almost the same as Xiao Qian's, except for a few more words: the information given in the topic has nothing to do with the requirements of the topic. Therefore, there is no solution to this problem.
Chen Da read and reread Lao Li's message, but he was still worried. Little Fu Shuo: "Dad, Uncle Liu across the street is a doctor. He may have a way. " Ignoring that the clock had pointed to ten o'clock at night, he knocked on the door of the Liu family.
Liu looked at the problem in his hand, thought for a long time, and checked the information on the Internet before carefully saying, "There is a solution to this problem. According to the information on the internet, when a bear is in the north and south poles of the earth, its falling speed is different from that in other parts of the earth. Elsewhere, objects like bears fall at a speed of 9.8 meters per second. In the north and south poles, the speed is faster. There are no bears in Antarctica, only in the North Pole, so the answer to this question should be white-the color of the polar bear's body is white. "
Hearing this, Chen Da suddenly slapped his thigh. Yes, how can there be no solution to the problem of "Olympic Mathematics"? Doctors are doctors, but they see things differently. Chen Da thanked Liu for coming home and asked Xiao Qian to write the correct answer under the title "White".
The next day, when Chen Da came home from work, she saw Xiao Gan sitting at home revising his homework, pouting. When asked, it turned out that the answer provided by Lao Liu last night was wrong, and the correct answer should be gray.
What? Chen Da brain "om", he hurriedly asked his daughter why is this answer.
The daughter looked at him discontentedly and said, "Our teacher said that the bear is indeed in the polar region, but the speed of the polar bear's descent is less than 10 meter. Only the Siberian bear closest to the polar region, with sparse hair, can fall at a speed of 10 meter per second after coming to the polar region. Siberian bears are generally gray. Therefore, the correct answer to this question is gray. "
Chen Da was stupid and asked awkwardly for a long time: "Did anyone in your class get it right?" Such a strange question, even the doctor answered it wrong, so there should be no pupils who can answer it correctly.
But Xiao Gan nodded: "Wang Qun is right."
Chen Da knows the grades of the students in his daughter's class very well. When he heard that Wang Qun got it right, his mouth didn't close for a long time. As far as he knows, Wang Qun was once ill and didn't go to school for half a semester, and his grades in all subjects were in a mess. How can he do it right?
"No way?" Chen Da asked the track.
"We all think this is impossible. We asked Wang Qun after class. " Xiao Gan said.
"Then how did he do it?" Chen Da's eyes were wide open.
"Wang Qun said he wanted to write black, but he forgot how to write the word black, so he picked a word he could write-gray. He said that gray and black are almost the same anyway. "
Chen Da was shocked. What's this? What's this called? ...