Go to a large food market to help my uncle sell vegetables. My uncle has many dishes, including eggplant, tomatoes, cucumbers and Chinese cabbage ... there are many people here. I watched my uncle sell vegetables while peeling edamame.

After a while, a man in his thirties came to buy food. He looks like the owner of a big hotel. He ordered a lot of vegetables: 20 Jin of vegetables, 10 Jin of Chinese cabbage and 10 Jin of potatoes ... My uncle was very busy, so I came to help. The man took out his wallet from his trouser pocket and looked at us with his arms in his hands. "How much is a catty of carrots?" Uncle asked. Uncle replied: "If you buy more, it will be one yuan and eight cents." Uncle added, "If you buy ten Jin, it's one and a half Jin." Uncle quickly shook his hand and said, "The purchase price is not enough." My uncle said, "Well, my son can't do any math problems. You help me calculate, two yuan a catty. " "Uncle readily promised. The topic is: A pasture full of grass can feed 17 cows for 30 days, or 19 cows for 24 days. Several cows are eating grass. After six days, four cows are sold, and the remaining cows eat grass for two days. How many cows are there? Uncle looked at it for a long time, but his head was almost scratched and he didn't remember it. So he called me, and when I read the questions, I would just write the answers on paper. First: 17 cattle for 30 days; 17*30=5 10 (copies); Is the number of 17 cows grazing for 30 days; 19 cows for 24 days; 19*24=456 (copies); Is the number of 19 cows grazing for 24 days; Multiplication (5 10-456)/(30-24)=9 (copies) is the number of times to grow grass every day; Original quantity 5 10-9*30=240 (copies). Suppose there are X cows, and the equation is (X+4)6+2X=240+8*9. Solve this equation. As soon as I did this, the uncle understood and fulfilled his promise to buy uncle's food. Everyone is very happy. My uncle also praised me as a "small boss", not only selling vegetables, but also applying mathematics to life.

This shows that mathematics is really important. There are footprints of mathematics everywhere in our life, and the history of mathematics is very long. There are many famous mathematicians, such as Chen Jingrun, Goldbach and Hua. Mathematics can solve many things in our life, and it should be a small partner in our life. We should lay a good foundation from an early age, use our mathematical knowledge to improve our lives and create a better tomorrow! We must learn math well, study with a happy mood, and understand math in life with a vision of discovery. I believe you can learn it well, make friends with it, and believe in yourself!