题目

根据题意，补全解题过程．如图，点C为线段AB上一点，D为线段AC的中点，若AD＝3，BC＝2，求BD的长．解：∵D为线段AC的中点，AD＝3，∴CD＝            ▲                   ＝            ▲                   ． （             ▲                  ）∵BD＝            ▲                   ＋            ▲                   ，BC＝2，∴BD＝             ▲                   ． 答案：解：∵D为线段AC的中点，AD=3，∴CD=AD=3．（线段中点定义）∵BD=CD+BC，BC=2，∴BD=5．

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