題組內容
2. (50%) Answer the following questions.
(a) Given \( y = \frac{x1^2 + x2^2}{x1 + x2} \), find the total differential \( dy \).
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2. (50%) Answer the following questions.
(a) Given \( y = \frac{x1^2 + x2^2}{x1 + x2} \), find the total differential \( dy \).