A useful method is given which can count the least positive period of a continuous function by Fourier coefficients.
给出了一个利用福里哀系数求非常值的连续周期函数的最小正周期的有效方法。
The expressions of lever coefficients are obtained according to four factors of the sales volume, unit gross profit, period fixed cost, interest in the different conditions.
根据销售量、单位毛利、期间固定成本、债务利息四个因素的不同状态，得到了相应的杠杆系数表达式。
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