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数学思想是解数学题的利器.下面以《三角形》一章为例,结合中考题来说明一系列数学思想的应用,供参考.一、方程思想例1(扬州)一个多边形的每一个内角均为108°,则这个多边形是().A.七边形B.六边形C.五边形D.四边形解:设边数为n,则(n-2)×180=108n,n=5.选C.点评:涉及多边形的内角(和)的计算,通常要利用多边形的内角和公式构造方程.
Mathematical thinking is the solution to the problem of mathematics. The following chapter takes “Triangle” as an example, combined with the test questions to illustrate the application of a series of mathematical ideas for reference. First, the equation of thought (Yangzhou) a corner of each polygon Is 108 °, then this polygon is () .A. Heptagon B. Hexagon C. Pentagonal D. Quadrilateral Solution: Suppose the number of edges is n, then (n-2) × 180 = 108n, n = 5. Select C. Comments: Calculations involving the interior angles (and) of polygons usually require the use of polygons’ interior angles and equations to construct equations.