Lu Xiaomei walked in with a math workbook and asked Jiang Xuan, "Xuanxuan, could you please take a look at this problem for me? I've looked at it many times, but I feel like it's missing some information."
Lu Shengye was quite surprised; he had never seen his younger sister so studious before.
Jiang Xuan took the workbook, looked at it, and said, "Hmm, this question does seem a bit obscure, but it actually contains a condition. Look, 'the function f(x) is continuous at x=2,' that statement itself is an important condition."
Lu Xiaomei looked puzzled: "What kind of condition is this?"
"This condition tells us that the function behaves stably at x=2."
"So how do we use this condition to solve the problem?"
Jiang Xuan took the pen and wrote on the draft paper, saying, "First, we need to find the expression of the function. The problem doesn't give it directly; we need to deduce it based on the characteristics of the function."
"Isn't there a graph here? Let's first deduce the specific form of the function, and then use the continuity condition to solve it."
Before long, Jiang Xuan wrote down the entire solution on his notebook.
"Sometimes math problems are like this: the conditions are implicit in the problem itself. Do more similar problems and summarize them, and you will gradually get used to this way of thinking."
"Thank you, HyunHyun-jie. I'll go and summarize it."
Lu Xiaomei ran out in a hurry, without saying a word to anyone the whole time.
Lu Shengye sighed, "My little sister has really changed."
Jiang Xuan smiled and said, "My little sister is actually quite smart; she just hadn't found a good learning method before."
Just then, Lu Pei'an returned.
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