題組內容
2. (10%) The differential equation is $(1 + \ln x + \frac{y}{x})dx = (1 - \ln x)dy$.
(2) If it is exact, solve the given initial-value problem.
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2. (10%) The differential equation is $(1 + \ln x + \frac{y}{x})dx = (1 - \ln x)dy$.
(2) If it is exact, solve the given initial-value problem.