Purpose: to improve knowledge of the program Mathcad and language Pascal explore Newton-Raphson method, the method of golden section and the method of secants find the minimum of the interval, to make the descr iption of Mathcad and its main functions, to describe the overall structure of the software.-Purpose: to improve knowledge of the program Mathcad and language Pascal　explore Newton-Raphson method, the method of golden section and the method of secants find the minimum of the interval, to make the descr iption of Mathcad and its main functions, to describe the overall structure of the software.