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证明若 N(t) 满足 \dot N = kN 且 k 为常数，则 N(t) = N(0) e^(kt) 。（你可以接受导数的非正式操作；这将在第10学期形式化。）
证明若 N(t) 满足 \dot N = kN 且 k 为常数，则 N(t) = N(0) e^(kt) 。（你可以接受导数的非正式操作；这将在第10学期形式化。）
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