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用不同的方法表示同一个平面图形的面积,计算结果始终相等.利用这一结论证明或计算某些数学问题的数学方法称之为“等积法”.“等积法”是初中数学中是很常见的一种非常重要的解题方法,利用这一方法在解决某些问题时具有化难为易、化繁为简、事半功倍的功效.下面列举“等积法”在解决中考试题中的应用几例,供读者参考.一、求三角形的高例1(2014年贺州)如图1,网格中的每个小正方形的边长都是1,△ABC每个顶点都在网格的交点处,则sinA=.
Using different methods to represent the area of the same plane graph, the calculation results are always equal. The mathematical method that uses this conclusion to prove or calculate some mathematical problems is called " In junior high school mathematics is a very common method of solving problems, the use of this method in solving some problems with the difficult, easy to use, multiplier effect. Here are the A few examples of the application of the middle school exam questions, for readers reference. First, seek a high triangular example 1 (Hezhou 2014) Figure 1, the grid of each small square side length is 1, △ ABC each vertex At the intersection of the grid, sinA =.