渐变虽是一种变化，但在变化过程中具有本质联系和必然趋势 --- 规律。这种规律往往以数列等形式实现。1、等差数列如果数列从第二项开始，每一项与前一项的差为常数d，则称为“等差数列”。d称为“公差”。等差数列可以写成a, a+d......, a+nd,··…的形式(下图l~4)。 2、等比数列如果数
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