在平面几何中,有一类求证线段“a=b+c”的问题,图形变化多、迷惑性强,不少同学对它望而生畏。其实只要掌握其规律、方法,这类题型并不难解。下面介绍几种证明方法:①转化法;②截长补短法;③介值法;④面积法;⑤比例法。 In the plane geometry, there is a problem of verifying the line segment “a=b+c”. The figure has many changes and is confusing. Many students are daunting about it. In fact, as long as you master its laws and methods, such questions are not difficult to understand. The following describes several kinds of proof methods: 1 transformation method; 2 truncating complement method; 3 interpolating method; 4 area method; 5 proportional method.