《义务教育数学课程标准》(2011年版)指出,除接受学习外,动手实践、自主探索与合作交流同样是学习数学的重要方式。在这个背景下,注重学生动手实践、自主探索的动手操作型试题在中考中大量涌现,其中也不乏出现一些极具思考价值的疑难问题,留待大家进一步思考和探索。2014年宁波市中考数学第25题第(3)问就是一个经典案例,现将该小题整理如下:定义:如果两条线段将一个三角形分成3个等腰三角形,我们把这两条线段叫做这个三角形的三分线。 Compulsory Education Mathematics Curriculum Standard (2011 Edition) pointed out that in addition to acceptance of learning, hands-on, independent exploration and cooperation and exchange is also an important way to learn mathematics. Under this background, hands-on test questions that focus on students’ hands-on practice and self-exploration have emerged in the middle school entrance examinations. Among them, there are some difficult problems that have great value in thinking and are left for further thinking and exploration. Now that the two lines divide a triangle into three isosceles triangles, we call these two lines the same as The triangle of the third line.