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A 500-word essay on life and mathematics after the fourth grade in Biaoying Primary School.
Mathematics often shows its shadow in life, and it is an indispensable part of life. In life, we should not only use mathematics, but also learn mathematical knowledge.

Today, my parents went for a walk in the park to keep fit, and let me watch my writing homework at home. By the time the homework was finished, they had not gone home. I just want to play online for a while when I am bored.

So, I hurried to the study, turned on the computer and was about to surf the Internet. I was stunned. My parents have long anticipated my move and even set a power-on password on the computer. This worries me, but I don't want to give up such a good opportunity like this. Just when I was worried, I found a password prompt at the bottom of the screen, and I was like grasping at straws. But a closer look, and let me make a difficult. It turns out that this hint is a math problem! The topic is as follows: 1+2+3+4+5 ................................................................................................................................................ The answer to this question is the power-on password.

When reading the topic, my head is big, don't say forget it. I have never done such a complicated topic. You can't surf the internet if you can't figure it out. In order to surf the Internet, I had to take out my paper and do a careful calculation. After several calculations, looking at the long formula, I really made a mistake. Just think carefully about whether there are any regular and simple methods available. After trying, we finally found a calculation method to reduce the Osuka to the minimum number, and so on,1+100 =10/,2+99 =1kloc-0/……………………………. When I entered the answer into the password, it opened immediately, which made me jump with excitement.

When my parents came home, I still had a good time online. They were surprised to see me surfing the Internet, so they asked me how to crack the password to surf the Internet. I told them the market calculation method just now. They laughed and said that they would use difficult questions to set passwords next time.

This incident made me understand that mathematics is everywhere in life and life is full of knowledge. As long as you are willing to use your head, you will certainly learn knowledge and solve problems!