题目已知:如图1,ABD、AEC都是等边三分析角形,求证:BE=DC.此题是人教版义务教育课程标准实验教科书八年级数学第150页的11题.该题也是典型的利用“边角边”证明三角形全等的习题.试题难度不大,只要利用等边三角形的性质就能完成.同时,此题有一定的代表性,不少省市的中考题就 The title is known as: In Figure 1, ABD, AEC are all equilateral three analysis angles, verification: BE = DC. This title is the eleventh problem of the eighth grade mathematics of the experimental teaching standard of compulsory education curriculum standard mathematics. Typical use of “edge edge” to prove the triangle’s exercise. The test is not difficult, as long as the nature of the use of equilateral triangle can be completed. At the same time, this question has a certain degree of representation, many provinces and cities in the examination questions