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我们在解线段与角的几何计算问题时，常常会遇到若直接利用线段与角的和、差、倍、分的办法求解．感觉很烦琐，甚至无从下手，原因是题中未知量太多，其实，这时可运用代数思想让字母参与运算，你会发现这样做计算很方便．请看下面几例． 例1 如图1，已知AC=2BC，M是AB的中点，MC=6．求AB的长． 分析与解：图中只有MC=6是已知，这时，
When we solve the problem of geometric calculation of line segments and angles, we often encounter solutions that use the sum, difference, times, and points of line segments and angles directly. Feeling very cumbersome, and even impossible to start with, the reason is that the unknown number of questions is too much, in fact, then you can use algebra to let the letters involved in the operation, you will find that this calculation is very convenient. Please see the following examples. Example 1 As shown in Figure 1, AC=2BC is known, M is the midpoint of AB, and MC=6. Ask for the length of AB. Analysis and solution: In the figure, only MC=6 is known. At this time,