On Sunday, when I was doing my math homework, I suddenly found a difficult problem. I thought, "Dad once said,' The topic of grade five is getting more and more difficult, and I will not go on. "There is an accurate method to solve this problem, which can be easily calculated with auxiliary lines. I will test him and teach him by the way. " I thought, I'll just copy the questions and wait for my father to come back.

After a long time, I have been excited to think: one day as a teacher, lifelong as a father, haha! I am the master of my father. I'm in such a good mood that I can't settle down to do my homework. After a while, dad finally pushed through the door. As if my heart were about to jump out, I immediately picked up the "roll paper", stood up and ran out of the room, shouting to pull my father into my room. I brought my father "roll paper" and asked him to do it next to me.

Dad began to analyze the topic, and I was doing my homework next to it. I stole a look at my dad, only to see that he set an unknown number under the topic, and I thought, "Haha! Dad really wants to solve it with such a complicated equation. It seems that I can teach him two methods. "

Since I saw my father set an unknown number, I have settled down to do my homework. After a while, my father said, "All right!" "I turned my head triumphantly and thought that the drama was about to begin, but something incredible happened.

Dad actually drew that key auxiliary line on the map and made the analysis process clear. The answer and thinking are exactly the same as my new method, and the problem can be easily solved with only one formula. Eyes are round, so all I thought before was daydreaming! Now it's dad who explains the analysis and solution process to me. I told my dad that I learned this topic in class after he kept giving me lectures. It was a classmate who first thought of this method.

Dad asked me why I couldn't figure it out, and I really didn't know how to answer.