The teacher told us a question: 58 million kilometers = () 1 100 million kilometers. One team did this: the forward speed between 10,000 km and 100 million km is 10000, so divide 58 million km by 10000 and move the decimal point four places to the left, which is 58 million km. I have another idea: first rewrite 1 10,000 kilometers into kilometers, which is 58 million kilometers, and then put the decimal point in the lower right corner of its billion digits, which is 58 million kilometers.

Today, we learned about "triangle", and learned what a triangle is, its characteristics, its classification and its wide application in practice. What I learned most in this lesson is the characteristics of triangles, and there is another thing I don't understand: why can an obtuse triangle have only one obtuse angle instead of all three angles? I asked several other students, and they didn't want to. I have to ask the teacher to tell me again tomorrow. Look, it's good to have a problem. It can make me think more and understand what I have learned thoroughly.