方程的本质就是指两个函数如 f(x)、g(x)在自变量 x 取何值时,f(x)=g(x)才能成立.用图象法求方程的实数解就是把方程当成函数的图象,把研究方程的解转化为求两个函数图象交点的坐标,交点的横坐标就是变量的值,而相应的纵坐标则是公共的函数值.方程的图象解法在中学数学中有较大的价值,在某些情况(如解超越方程时)它的应用还有独到之处.然而这个方法只是在讲到解某些代数方程和指数方程时提到一下,并没有 The essence of the equation is that when two functions such as f(x) and g(x) take the value of the independent variable x, f(x)=g(x) can be established. The real solution of the equation is obtained by the image method. The equation is treated as a function of the image, transforming the solution of the study equation into the coordinates of the intersection of the two function images. The abscissa of the intersection is the value of the variable, and the corresponding ordinate is the value of the common function. Image solution of the equation It is of great value in middle school mathematics. In some cases (such as solving transcendental equations) its application has its own uniqueness. However, this method is only mentioned in the solution of some algebraic equations and exponential equations. not at all