The old man looked at the question and nodded repeatedly, kindly asking, "Hmm, you can indeed solve it this way, but why haven't you finished the paper yet, and already thinking of slacking off?"
"Grandpa Teacher, it's not that I'm lazy, mainly I've been reading all afternoon and my stomach feels a bit hungry. If I solve everything using differential geometry, it will take at least half an hour. If I use an easier method, I can finish in twenty minutes and go back to eat!" Qiao Yu patted his stomach and said.
Yuan Zhengxin suddenly realized and immediately said, "Right, right, it's my fault, Grandpa Teacher. Oh, I forgot you're only fifteen, at the age of growing, I wasn't hungry, so I thought you wouldn't be hungry either. Well, you don't need to write the entire solution for the big problem, just write down the idea."
