黄金分割法的原理：把一条线段分割为两部分，使其中一部分与全长之比等于另一部分与这部分之比。其比值是一个无理数，取其前三位数字的近似值是0.618-Golden principles of the method: the line segment is divided into two parts, so that the part is equal to the ratio of the full length of another portion of this part of the ratio. The ratio is an irrational number, whichever is the first three digits of the approximation is 0.618