由以下方法求极值：(1)黄金分割法求极值 (2)使用平分法求极值(3)使用成功-失败法求极值(4)牛顿法求极值(5)使用三点二次插值法求极值(6)使用三次插值法求极值 -Extremum by the following methods: (1) golden section method for extreme (2) using bisection method for extreme (3) the use of success- failure method for extrem