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如图,把线段AB分成两条线段AC和BC(AC>BC), 且使AC是AB和BC的比例中项,这叫做把线段AB黄金分割(gold section),点C叫做线段AB的黄金分割点.
As shown in the figure, the line segment AB is divided into two line segments AC and BC (AC>BC), and AC is a proportional middle term of AB and BC. This is called gold segment of line segment AB, and point C is called gold of line segment AB. Split point.