几何证明不象代数计算那样有程式可循,五花八门、精彩纷呈的证法使得有人爱不释手.而另一部分人则退避三舍,其实只要掌握正确的证明思路的探求方法,则不难拨开证明中的“迷雾”,使几何证明从此不再神秘.下面以相似三角形为例加以说明.例1如图1,△ABC∽△ADE,求证:DE∥BC图1证明 Geometry proves that there are no programs like algebraic calculations. There are a variety of evidences that make people adore it. And others evade it. In fact, as long as you have a proper method of exploring ideas, it is not difficult to dismiss the proofs. Fog, so that the geometric proof is no longer mysterious. The following example illustrates similar triangles. Example 1 As shown in Figure 1, △ ABC ∽ △ ADE, verification: DE ∥ BC Figure 1 prove