// 双点弦截法迭代#include "stdafx.h"#include <cmath>#include <iostream>#include <iomanip>double fx(double x){double f = log(x) +2.0/9/(x - 1) - 4.697;//注意用2.0/9, 而不是2/9return f; //f(x) = 0中的f(x)函数形式}v