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在解决数学问题时,有许多种将未知转化为已知的手段.其中之一是通过设元,寻找已知与未知之间的等量关系;通过构造方程,求解方程,完成从未知向已知的转化.这种解决问题的思想就是方程思想.利用方程思想去解决与多边形相关的角的问题,简捷便利.一、求解多边形的内角问题:例1(2012年·无锡)若一个多边形的内角和为1 080°,则这个多边形的边数为().
In solving mathematical problems, there are many ways to transform unknown into known ones, one of which is to look for the equal relation between known and unknown by constructing metaphor, solve equations by constructing equations, The transformation of knowledge .This problem-solving idea is the idea of equation.Using the idea of equations to solve the problem of polygon-related corners, simple and convenient. First, solve the polygon’s interior angle problem: Example 1 (2012 Wuxi) If a polygon The interior angle is 1 080 °, then the number of sides of this polygon is ().